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. Author manuscript; available in PMC: 2023 Jun 6.
Published in final edited form as: Risk Anal. 2015 Aug 6;36(7):1427–1458. doi: 10.1111/risa.12454

Synthesis of Evidence to Characterize National Measles and Rubella Exposure and Immunization Histories

Kimberly M Thompson 1,2,*, Cassie L Odahowski 1, James L Goodson 3, Susan E Reef 3, Robert T Perry 4
PMCID: PMC10243507  NIHMSID: NIHMS1904061  PMID: 26249328

Abstract

Population immunity depends on the dynamic levels of immunization coverage that countries achieve over time and any transmission of viruses that occur within the population that induce immunity. In the context of developing a dynamic transmission model for measles and rubella to support analyses of future immunization policy options, we assessed the model inputs required to reproduce past behavior and to provide some confidence about model performance at the national level. We reviewed the data available from the World Health Organization (WHO) and existing measles and rubella literature for evidence of historical reported routine and supplemental immunization activities and reported cases and outbreaks. We constructed model input profiles for 180 WHO member states and three other areas to support disease transmission model development and calibration. The profiles demonstrate the significant variability in immunization strategies used historically by regions and member states and the epidemiological implications of these historical choices. The profiles provide a historical perspective on measles and rubella immunization globally at the national level, and they may help immunization program managers identify existing immunity and/or knowledge gaps.

Keywords: Measles, routine immunization, rubella, supplemental immunization activities (SIAs)

1. INTRODUCTION

Individual immunity derives from infection and/or vaccination, which individuals, physicians, and health systems can track by recording cases of disease and receipt of vaccine. Population immunity represents the aggregation of all individual immunity in the population, and it changes with time.(1) Population immunity drives the dynamics of the transmission of infectious agents (e.g., sustained transmission, disease die-out, or episodic transmission following reintroduction), and it determines the burden of disease.(2) Research priorities for global measles and rubella control and eradication identified by a group of experts in 2012 included the need for disease modeling to better understand the levels of population immunity required for elimination in various settings.(3) Using models to characterize population immunity(1) represents a significant opportunity to improve efforts to manage vaccine-preventable diseases prospectively. For example, models can help policymakers evaluate the economic and health tradeoffs of potential management strategies, estimate the impact of immunization and burden of disease,(46) and visualize the benefits of interventions that otherwise may not get counted because surveillance systems do not detect prevented cases.(7,8) More importantly, as countries and regions make progress toward (and achieve) elimination goals by increasing population immunity, the number of cases declines significantly and approaches (or reaches) zero.

Modeling population immunity requires integrating data about population demographics, immunization, and exposure history, along with assumptions about the transmissibility of the virus, mixing, and other factors. Prior efforts to assess national-level population immunity led to the development of a simple measles strategic planning (MSP) tool intended for use by national program managers to approximate potential population immunity based on various vaccination strategies.(6) However, the MSP tool did not include a dynamic disease transmission model and a similar tool for rubella does not exist. Developing dynamic transmission models requires that they use time-varying inputs based on the best available evidence, recognizing that significant limitations may exist. Models should rely on transparent and well-founded assumptions and provide estimates consistent with historical programmatic experience, reported cases, and available serological study results.(9)

The Global Vaccine Action Plan(10) established by the World Health Organization (WHO) and its partners and approved by the World Health Assembly in 2012 set a target for measles and rubella elimination in at least five WHO regions by 2020.(10) The Measles and Rubella Initiative developed a strategic plan that indicates the need for additional global, national, and regional commitments to achieve and maintain “high levels of population immunity by providing high vaccination coverage with two doses of measles- and rubella-containing vaccines” through routine immunization (RI) and supplemental immunization activities (SIAs) to stop measles and rubella virus transmission and achieve elimination goals.(11) RI provides doses of vaccine to children as they reach the age(s) indicated by the national immunization schedule, which spreads these doses out throughout the calendar year. In contrast, SIAs involve campaigns that occur over a relatively short period of time and typically target a broad age range. RI and SIAs lead to very different epidemiological consequences, with RI providing steady inflow of immunization and SIAs boosting population immunity in pulses.

To support efforts to make an investment case for global management of measles and rubella,(12) we recognize the need to develop a dynamic model of measles and rubella viral transmission and population immunity. Although we focus on the global or regional scale, data reporting and policy interventions occur at the national level, and getting the global-level estimates correct implies the need to aggregate up from the national level. Application of the model to specific countries requires synthesis of the data used as model inputs, which led us to construct national model input profiles. The next section describes the methods we used to review the available evidence and to develop the immunization assumptions for the profiles. This work complements a separate review of the literature that characterizes the available serological data.(9)

2. METHODS

We obtained historical immunization data available from the WHO and UNICEF(1315) and demographic data from the U.N. Population Division (UNPD)(16) to support the characterization of historical and forecasted population dynamics. We excluded from further analysis the following 14 relatively small WHO member states (out of 194 current WHO member states): Andorra, Antigua and Barbuda, Cook Islands, Dominica, Kiribati, The Marshall Islands, Monaco, Nauru, Niue, Palau, Saint Kitts and Nevis, San Marino, Seychelles, and Tuvalu. Our analysis also excludes WHO nonmember states, except that we included three population areas associated with two other large member states: Hong Kong and Macao (China) and Puerto Rico (United States) given the availability of population and immunization data for these areas. The left columns of Table I list the 180 member state profiles and three other geographic areas we characterized by their ISO code and World Bank Income Level(17) organized according to WHO region. The profiles provide data for the states as they existed in 2013, with retrospective population estimates from the UNPD.(16) The profiles account for some major changes that occurred for some states (e.g., creation of new states through independence as well as the dissolution of the Union of Soviet Socialist Republics and Yugoslavia).

Table I.

Characteristics of Modeled Areas in 2013, Including World Bank Income Level (WBIL),(17) Population,(16) Year of Routine Immunization (RI) Introduction of a Measles-Containing Vaccine First Dose (MCV1), Second Dose (MCV2), and Rubella-Containing Vaccine (RCV) in the Primary Series and/or Given Selectively to Female Adolescents; We Include Potential Future Introductions (Note a) and List the References Used to Characterize RI

Region and Member State ISO WBIL Population (Millions) MCV1 MCV2 RCV Primary RCV Female Adolescents References(1315,27)
Africa (AFR) 2833
Algeria DZA UMI 39.2 1985 1997 2015a
Angola AGO UMI 21.5 1983 2017a
Benin BEN LOW 10.3 1979 2017a 34
Botswana BWA UMI 2.0 1976 2011 2016a 35
Burkina Faso BFA LOW 16.9 1980 2015a 2015a 3638
Burundi BDI LOW 10.2 1981 2013 2016a 39
Cameroon CMR LMI 22.3 1966 2015a 4045
Cape Verde CPV LMI 0.5 1985 2010 2010 46
Central African Republic CAF LOW 4.6 1967 2017a 47,48
Chad TCD LOW 12.8 1967 2018a 4953
Comoros COM LOW 0.7 1984 2016a 2016a
Congo, Democratic Republic COD LOW 67.5 1967 2017a 5457
Congo, Republic COG LMI 4.4 1967 2016a
Cote d’Ivoire CIV LMI 20.3 1984 2017a 58
Equatorial Guinea GNQ UMIb 0.8 1985 2018a
Eritrea ERI LOW 6.3 1980 2012 2018a
Ethiopia ETH LOW 94.1 1980 2016a 2017a 5964
Gabon GAB UMI 1.7 1985 2019a
Gambia, The GMB LOW 1.8 1967 2012 2015a 6571
Ghana GHA LMI 26.0 1978 2012 2013 7274
Guinea GIN LOW 11.7 1974 2018a
Guinea-Bissau GNB LOW 1.7 1983 2018a 7577
Kenya KEN LOW 44.4 1978 2013 2015a 7885
Lesotho LSO LMI 2.1 1981 1992 2016a
Liberia LBR LOW 4.3 1974 2017a 86
Madagascar MDG LOW 22.9 1984 2015a 2016a 87
Malawi MWI LOW 16.4 1980 2015a 2016a 35,88,89
Mali MLI LOW 15.3 1974 2017a 90
Mauritania MRT LMI 3.9 1974 2017a 91
Mauritius MUS UMI 1.2 1982 2003 2019a
Mozambique MOZ LOW 25.8 1981 2015a 2017a 88,9299
Namibia NAM UMI 2.3 1975 2015a 2015a 100
Niger NER LOW 17.8 1974 2018a 101,102
Nigeria NGA LMI 173.6 1974 2017a 103110
Rwanda RWA LOW 11.8 1981 2014a 2014 111
Sao Tome and Principe STP LMI 0.2 1981 2013 2017a
Senegal SEN LMI 14.1 1986 2014a 2013 112
Sierra Leone SLE LOW 6.1 1974 2015a 2016a 113
South Africa ZAF UMI 52.8 1975 1994 2019a 100,114
South Sudan SSD LOW 11.3 1981 2017a
Swaziland SWZ LMI 1.2 1981 1995 2014
Togo TGO LOW 6.8 1967 2016a
Uganda UGA LOW 37.8 1981 2018a
United Republic of Tanzania TZA LOW 49.3 1970 2014 115
Zambia ZMB LMI 14.5 1983 2016a
Zimbabwe ZWE LOW 14.1 1981 2015
Americas (AMR) 116119
Argentina ARG UMI 41.4 1978 1998 1997 120,121
Bahamas, The BHS HIGH 0.4 1978 2001 1991
Barbados BRB HIGH 0.3 1977 1997 1977 122
Belize BLZ UMI 0.3 1980 2005 1996
Bolivia BOL LMI 10.7 1979 (2011)c 2000 123
Brazil BRA UMI 200.4 1973 1992 1992d 124126
Canada CAN HIGH 35.2 1963 1997 1969 1971–1982 127
Chile CHL HIGH 17.6 1964 1992 1990 128130
Colombia COL UMI 48.3 1979 1997 1995 131
Costa Rica CRI UMI 4.9 1967 1992 1974 132134
Cuba CUB UMI 11.3 1971 2004 1988 135,136
Dominican Republic DOM UMI 10.4 1974 (2004)c 2009 2004 137
Ecuador ECU UMI 15.7 1979 2008 1997 138
El Salvador SLV LMI 6.3 1979 2000 1997 138
Grenada GRD UMI 0.1 1982 2000 1993
Guatemala GTM LMI 15.5 1980a 2001 139
Guyana GUY LMI 0.8 1982 2001 1995
Haiti HTI LOW 10.3 1982 2008 140142
Honduras HND LMI 8.1 1979 1997 143
Jamaica JAM UMI 2.8 1978 2002 1993 1978–2001 144,145
Mexico MEX UMI 122.3 1973 1991 1998 146,147
Nicaragua NIC LMI 6.1 1979 1998
Panama PAN UMI 3.9 1979 1992 1992 148,149
Paraguay PRY LMI 6.8 1980 (2002)c 2004 2000 147
Peru PER UMI 30.4 1979 2007 2003
St. Lucia LCA UMI 0.2 1982 1991 1986 150
St. Vincent and the Grenadines VCT UMI 0.1 1982 1997 1991
Suriname SUR UMI 0.5 1979 2005 1993
Trinidad and Tobago TTO HIGH 1.3 1984 2001 1984 1982–2000 151,152
United States USA HIGH 320.1 1963 1989 1969 153158
Puerto Ricoe PRI HIGH 3.7 1963 1989 1969
Uruguay URY HIGH 3.4 1979 1992 1982
Venezuela, RB VEN UMI 30.4 1980 2009 1998 131,159,160
Eastern Mediterranean (EMR) 161163
Afghanistan AFG LOW 30.6 1978 2004 2018a 164
Bahrain BHR HIGH 1.3 1974 1985 1985 165,166
Djibouti DJI LMI 0.9 1982 2011 2019a
Egypt, Arab Rep. EGY LMI 82.1 1977 1999 1999 167,168
Iran, Islamic Rep. IRN UMI 77.4 1967 1984 2004 169,170
Iraq IRQ UMI 33.8 1980 1989 1989 1995–2004 171
Jordan JOR UMI 7.3 1979 1995 2000 172
Kuwait KWT HIGH 3.4 1980 1985 1985 1975–2013 173
Lebanon LBN UMI 4.8 1982 1995 1995
Libya LBY UMI 6.2 1980 2001 2001
Morocco MAR LMI 33.0 1982 2003 1986d 174
Oman OMN HIGH 3.6 1980 1994 1994 1996–2013 175177
Pakistan PAK LMI 182.1 1980 2009 2016a
Qatar QAT HIGH 2.2 1980 1996 1992
Saudi Arabia SAU HIGH 28.8 1974 1991 1991 1978–1991 178
Somalia SOM LOW 10.5 1979 2016a 179
Sudan SDN LMI 38.0 1981 2012 2015a
Syrian Arab Republic SYR LMI 21.9 1980 1993 1999
Tunisia TUN UMI 11.0 1979 1981 2004 180,181
United Arab Emirates ARE HIGH 9.3 1980 1984 1984 1998–2013 182
Yemen, Rep. YEM LMI 24.4 1980 2004 2014
Europe (EUR) 183188
Albania ALB UMI 3.2 1990f 2001 2001 189
Armenia ARM LMI 3.0 1967 1986 2002 190
Austria AUT HIGH 8.5 1974 1994 1994 1984–1994 191193
Azerbaijan AZE UMI 9.4 1967 2001 2003 190
Belarus BLR UMI 9.4 1967 1987 1996 190,194
Belgium BEL HIGH 11.1 1975 1994 1985 1973–1994 195
Bosnia and Herzegovina BIH UMI 3.8 1969 1975 1975d 1977–2008 196,197
Bulgaria BGR UMI 7.2 1969 1982 1993 1988–2000 198
Croatia HRV HIGH 4.3 1968 1968g 1975 1975–2003 199,200
Cyprus CYP HIGH 1.1 1974 (2004)c 2006 1989 1974–1989
Czech Republic CZE HIGH 10.7 1969 1975 1986 1982–1997 201
Denmark DNK HIGH 5.6 1987 1987g 1987 202
Estonia EST HIGH 1.3 1967 1986 1992 190
Finland FIN HIGH 5.4 1975 1982 1982 1975–1988 203205
France FRA HIGH 64.3 1983 1996 1983 1970–1996 206208
Georgia GEO LMI 4.3 1966 (1988, 1989, 1993)c 1997 2004 209
Germany DEU HIGH 82.7 1970 1986 1980 1975–1997 210212
Greece GRC HIGH 11.1 1975 1991 1989 1977–1989 213,214
Hungary HUN UMI 10.0 1974 1989 1989 215,216
Iceland ISL HIGH 0.3 1976 2003 1989 1977–2002 217
Ireland IRL HIGH 4.6 1983 1992 1988 1971–1988 218,219
Israel ISR HIGH 7.7 1967 1994 1988 1973–1979 220,221
Italy ITA HIGH 61.0 1976 2004 1990 1972–2008 222,223
Kazakhstan KAZ UMI 16.4 1967 1986 2005 190,224
Kyrgyz Republic KGZ LOW 5.5 1967 1986 2002 190,225,226
Latvia LVA HIGH 2.1 1967 1986 1993 1993–2002 190
Lithuania LTU HIGH 3.0 1967 1986 1992 1992–1996 190,227
Luxembourg LUX HIGH 0.5 1983 1994 1994 228
Macedonia, FYR MKD UMI 2.1 1969 1997 1983 1975–2012 196,229
Malta MLT HIGH 0.4 1983 1991 1989d 1976–1992 230
Moldova MDA LMI 3.5 1967 1986 2002 190
Montenegro MNE UMI 0.6 1972 1995 1995 1977–1992 196,197,231
Norway NOR HIGH 5.0 1969 1983g 1983 1978–1982 232
Poland POL HIGH 38.2 1974 1991 1988 1989–2005 233
Portugal PRT HIGH 10.6 1980 1990 1984 1984–1990 234,235
Romania ROU UMI 21.7 1998a 1998 2002 236,237
Russian Federation RUS HIGH 142.8 1967 1986 2000 190
Serbia SRB UMI 9.5 1971 1993 1993 238
Slovak Republic SVK HIGH 5.5 1980 1975 1986 1985–1992 201
Slovenia SVN HIGH 2.1 1968 1978 1990 1973–1990 239
Spain ESP HIGH 47.0 1978 1996 1981 1979–1994 240,241
Sweden SWE HIGH 9.6 1971 1982g 1982 1972–1982 242
Switzerland CHE HIGH 8.1 1971 1996 1971 1974–1986 243245
Tajikistan TJK LOW 8.2 1967 1986 2009 190
The Netherlands NLD HIGH 16.8 1976 1987 1987 1974–1987 246248
Turkey TUR UMI 74.9 1987 1997 2006 249251
Turkmenistan TKM UMI 5.2 1967 1988 2007 190
Ukraine UKR LMI 45.2 1967 1986 2001 190,252
United Kingdom GBR HIGH 63.1 1968 1996 1988 1970–1988 253256
Uzbekistan UZB LMI 28.9 1967 1986 2006 190
Southeast Asia (SEAR) 257,258
Bangladesh BGD LOW 156.6 1980 2012 2012 259
Bhutan BTN LMI 0.8 1979 2006 2006 260
India IND LMI 1252.1 1985 2010 2015a 261,262
Indonesia IDN LMI 249.9 1983 2003 2018a 263
Korea, Dem. Rep. PRK LOW 24.9 1980 2008 2015a
Maldives MDV UMI 0.3 1981 2007 2007
Myanmar MMR LOW 53.3 1986 2008 2015a 264
Nepal NPL LOW 27.8 1981 2014a 2014
Sri Lanka LKA LMI 21.3 1984 2001 1996 1996–2010 265
Thailand THA UMI 67.0 1984 1996 1996 1986–1998 266269
Timor-Leste TLS LMI 1.1 1983 2015a
Western Pacific (WPR) 270,271
Australia AUS HIGH 23.3 1975 1994 1993 1971–1993 272,273
Brunei Darussalam BRN HIGH 0.4 1970 1997 1984
Cambodia KHM LOW 15.1 1984 2012 2013
China CHN UMI 1385.6 1965 1965 2008 274276
Hong Kong SAR, Chinae HKG HIGH 7.2 1983 2001 1990 277279
Macao SAR, Chinae MAC HIGH 0.6 1983 2001 1985
Fiji FJI UMI 0.9 1980 2003 2003 1975–1994 280,281
Japan JPN HIGH 127.1 1966 2008 1989h 1977–1994 282284
Korea, Rep. KOR HIGH 49.3 1965 1997 1980 285,286
Lao PDR LAO LMI 6.8 1981 2012 2013 287,288
Malaysia MYS UMI 29.7 1983 2002 2002 1987–2008 289293
Micronesia, Fed. Sts. FSM LMI 0.1 1987 1995 1970d 294
Mongolia MNG LMI 2.8 1967 1987 2009
New Zealand NZL HIGH 4.5 1969 1992 1970 1979–1991 295,296
Papua New Guinea PNG LMI 7.3 1983 1991i 2015a 297299
Philippines PHL LMI 98.4 1982 2009 2009
Samoa WSM LMI 0.2 1982 (2002)c 2006 2004
Singapore SGP HIGH 5.4 1976 1990 1990 1976–1981a 300,301
Solomon Islands SLB LMI 0.6 1986 2012 2012
Tonga TON UMI 0.1 1981 2002 2002
Vanuatu VUT LMI 0.3 1982 2014
Vietnam VNM LMI 91.7 1982 2006 2015a
a

Assumption about future vaccine adoption.

b

High-income country grouped with UMI countries given vaccine use.

c

Schedule included second dose in year(s) in parentheses prior to the start of the continuous two-dose schedule that started in the year not in parentheses (if MCV2 introduced).

d

RCV phased in starting in year indicated (fully implemented in 2000 for Bolivia, 1978 for Federated States of Micronesia, 2003–2008 then 2014 for Morocco, 1981 in Bosnia and Herzegovina, 1992 in Malta).

e

Nonmember state.

f

Campaigns used to deliver vaccine during prior years.

g

Introduction of two-dose schedule in the indicated year led to actual delivery of a second dose to children in 1973 for Croatia, 1999 for Denmark, 1993 for Norway, and 1994 for Sweden (i.e., second dose introduced at an earlier age in the schedule).

h

MMR suspended due to mumps component of vaccine in 1993, which impacted delivery of rubella component.

i

Dose at six months counted such that dose at nine months counted as a second dose.

For each profile, we reconstructed the immunization history for measles and rubella for both RI and SIAs by year since measles vaccine became available for use in 1963. We used the data available from WHO as a base for reconstruction of national immunization histories, and we relied on papers we identified in our literature review to provide historical and other supplemental information, particularly related to immunization schedules. We started with the RI data available from the WHO-UNICEF estimates, which characterize historical vaccine coverage since 1980.(1315) We also included data reported by some member states to WHO that extended back to the beginning of the Expanded Programme on Immunization (EPI) in 1974 (Marta Gacic-Dobo, Personal Communication, 2013). For countries established after 1980, UNPD provides retrospective population estimates. For the immunization assumptions, we assume the immunization strategy used by the parent prior member state as reported to WHO from 1974 up until the time of independence and we apportion historical estimates of cases based on the relative population sizes.

Vaccine schedules vary significantly across member states at any single point in time(18,19) and they change for individual member states over time. Consistent with current practice, we assume that vaccine options include continued use of measles- and rubella-containing vaccines (MRCVs) in high-income member states and continued use of measles with or without rubella-containing vaccines (M(R)CVs) in member states of all other income levels.(15,19) Given our focus on measles and rubella only, we characterize the historical vaccine use (i.e., schedule and coverage) according to the measles first dose (MCV1), measles second dose (MCV2), and rubella dose (RCV) given in the primary RI series or selectively to adolescent and adult females. We report the timing of vaccine introduction for MCV1, MCV2, and RCV (primary and/or selective for adolescent and adult females). Thus, although the WHO rubella vaccine position paper revised in 2011 recommends vaccination of both sexes, because unvaccinated males contribute to sustained rubella virus transmission(20) we sought to capture all historical practices.

To supplement the information available from WHO, we searched the literature indexed in PubMed and the Science Citation Index (ISI Web of Knowledge) up through June 10, 2014 for papers in English to identify additional information about national immunization histories. We searched using the key words “measles” or “rubella” and “(schedule or routine or EPI or supplement*)” and the names of continents, regions, and individual member states. We screened the records for relevance to national or regional immunization practices using indexed information or the full text of articles with insufficient information in the index. For each member state, we capture the RI vaccine used as M, R, or MR to indicate the use of a single antigen or use of both antigens of interest in a combination vaccine and ignoring any additional components (e.g., mumps in MMR).

In 2014, WHO-UNICEF provided estimates of MCV2 coverage for countries that reported MCV2 national coverage estimates for the years 2000–2013. In general, we used the WHO-UNICEF coverage estimates, although in a few instances we modified these based on national data. For example, the WHO-UNICEF MCV1 coverage estimates for the United States for 1980–1993 implied significantly higher coverage nationally than reported in the preceding or following years, and we could not identify the source for the estimates. Based on information from national immunization program experts, who noted the importance of the school immunization requirements and provided unpublished estimates of vaccine procurement data, we used judgment for the values in the profile. We interpolated for missing data and provided estimates for all second doses for those member states that do not report MCV2 coverage to WHO (i.e., the Czech Republic, Finland, Ireland, Italy, and the United States). For historical selective rubella immunization, which primarily occurred in Europe and Australia, we estimated coverage using a single value for the duration based on any national information that we found, although these uncertain values may require adjustment depending on behavior of the transmission model.

We identified some overlap in activities between the RI and SIA data we extracted for some doses, which we reconciled as either delivered through RI or as an SIA. For example, some member states implemented booster doses for children that included delivery in schools (e.g., Cyprus, Japan). If these occurred throughout a school year, we included these in RI, but if they occurred during a shorter period of time then we treated them as SIAs. In the absence of WHO-UNICEF estimates for RCVs, we generally assume the same coverage for measles and rubella for those doses in the RI schedule that include both vaccines. However, for some areas that phased in rubella immunization, we assumed different coverage levels for M and R during the phase-in period (e.g., during the first year or first few years), which leads to separate points (or series) in the RI profile for M and R until the time of complete phase-in. We also characterized the historical SIA activities, starting with a database maintained by the WHO for measles SIAs(21) and then adding information obtained from WHO(18) related to SIAs prior to 2000 and SIAs using rubella-containing vaccine and using information we found in the literature. For each SIA, we sought to characterize the timing (i.e., start and end date), target population (i.e., age, sex, and/or risk groups), antigens included in the vaccine used (i.e., M, R, or MR, ignoring any other antigens like mumps), estimated coverage, and other characteristics that might impact the interpretation of the data relevant for use in transmission modeling. We classified SIAs as national (n) or subnational (s) to ensure appropriate adjustment of SIA coverage estimates to account for the fraction of the national population targeted by the SIA, similar to the methods used in models to account for subnational polio SIAs.(2)

The information available for comparison to transmission model output comes in two primary forms: reported case series of associated disease and deaths (considering the age distribution when available), which we characterize here, and the results of serological surveys that provide a snapshot of the dynamic population immunity at the point in time of data collection, which we characterize separately.(9) The WHO summarizes reported annual cases for measles and rubella,(15) with data available for some member states back to 1974 for measles and back to 1998 for rubella.(18) We synthesized the reported health outcome data and supplemented them with data from the literature that summarized reported cases for earlier dates when available, and we particularly searched for information about the timing of large outbreaks that occurred prior to case reporting to WHO for the two different diseases.(15) Surveillance systems typically miss cases, and consequently reported cases most likely underestimate actual cases. Relatively recent modeling efforts provided retrospective estimates for measles,(5) which we considered for purposes of comparison.

3. RESULTS

Table I summarizes the evidence that we identified for the different member states organized by region. Since not all member states currently include rubella immunization in their existing national immunization schedules,(19) we include our current assumptions (noted with an a) about when member states yet to introduce rubella vaccine might do so in response to the current Gavi funding opportunity and/or regional goals to control or eliminate rubella.(22) For the full profile, we characterize the RI schedule, antigens included in the vaccine (i.e., M, R, or MR), and estimated coverage by year historically for each member state. Table I summarizes the evidence base we used as a basis for our assessments.

Table II summarizes the historical SIAs as national (n) or subnational (s) according to the year in which the SIAs started for the data we identified. Blank lines in Table II generally indicate no SIAs performed, particularly for high-income countries, but the data remain limited, probably miss many (most) SIAs conducted for outbreak response, and may include planned SIAs that did not actually occur or exclude SIAs that occurred but we did not find recorded. For areas with more than one SIA during a year (i.e., multiple subnational SIAs), we indicated the total number of separate SIAs. In some cases, we found information in the literature that indicated an SIA strategy instead of RI for the delivery of child immunization during the early part of the immunization program (e.g., Albania, Romania). In such cases, we used the WHO-UNICEF estimated coverage for SIAs during the affected years and we began RI once this approach ended. This change led to later implied dates of RI starting for MCV1 in Table I for some member states than implied by assuming that the WHO-UNICEF coverage estimates all reflect delivery in RI.

Table II.

Assumptions for Supplemental Immunization Activities (SIAs) for Areas with Any Historical SIAs and Associated References Characterized by the Antigen(s) Used (i.e., M, R, or MR, the Latter Two Bolded for Visibility), the SIA Start Year [Number of SIAs Started that Year if Greater than 1], and as National (n) or Subnational (s)

Region and Member State ISO SIA Antigen Used: Year[Number Started that Year if Greater than 1] and Scope (n or s) Refs.(21)
Africa (AFR) 30,31,33,302,303
Algeria DZA M:1996n, 2003n, 2007n, 2011s
Angola AGO M: 1997s, 1999s, 2003n, 2006n, 2009n, 2011n, 2014n; MR: 2017na, 2020na
Benin BEN M: 1967s, 1997s, 1998s, 1999s, 2001s, 2003s, 2005n, 2008n, 2011n, 2014n; MR: 2017na, 2020na 28
Botswana BWA M: 1997s, 1998s, 2001n, 2005n, 2009n, 2013n; MR: 2016na, 2019na 35
Burkina Faso BFA M: 1967s, 1998s, 1999n, 2001n, 2004n, 2007n, 2009s, 2011s, 2012[2]s; MR: 2014n 2018na, 2020na 28,304306
Burundi BDI M: 1999s, 2001s, 2002s, 2003s, 2004n, 2005n, 2006n, 2009n, 2010[2]s, 2011s, 2012n; 2013n; MR: 2015na, 2019na
Cameroon CMR M: 1969s, 1999s, 2001[2]s, 2002n, 2006s, 2007s, 2009n, 2010[2]s, 2011s, 2012n; MR: 2015na, 2018na 28,4045,307,308
Cape Verde CPV M: 1998n, 2005n, 2009n; MR: 2013n, 2017na
Central African Republic CAF M: 1967s, 1998s, 2005s, 2006s, 2008n, 2011n, 2013[4]s; MR: 2017na, 2019na 28,47,48
Chad TCD M: 1967s, 1997s, 1999s, 2005[2]s, 2006s, 2008n, 2009[3]s, 2011s, 2012n, 2014[2]n, 2016na; MR: 2018na, 2020na 28,4951,309
Comoros COM M: 2003s, 2005s, 2006s, 2007n, 2010s, 2013n; MR: 2016na, 2019na
Congo, Democratic Republic COD M: 1996s, 1997s, 1999s, 2000s, 2002s, 2003s, 2004s, 2005s, 2006[2]s, 2007n, 2008s, 2009s, 2010s, 2011[5]s, 2012[15]s, 2013[3]s, 2014[5]s; MR: 2016na, 2019na 58
Congo, Republic COG M: 1967s, 1998n, 2004[2]s, 2007n, 2010n, 2011[2]s, 2012n, 2013n, 2015na, 2016na; MR: 2017na, 2018na, 2019na, 2020na 28,54,56,57
Cote d’Ivoire CIV M: 1967s, 2003[2]s, 2005n, 2008n, 2011n, 2014n; MR: 2017na, 2020na 28
Equatorial Guinea GNQ M: 2003[2]s, 2005n, 2009n, 2011n, 2012n; MR: 2016na, 2018na, 2020na
Eritrea ERI M: 1997s, 1998s, 1999s, 2000[2]s, 2001s, 2003n, 2004s, 2006s, 2009n, 2012s; MR: 2015na, 2019na
Ethiopia ETH M: 1998s, 1999s, 2000[2]s, 2001s, 2002s, 2003[2]s, 2004s, 2005[2]s, 2006s, 2007s, 2008s, 2009[4]s, 2010[2]s, 2011[2]s, 2013n; MR: 2016na, 2019na 59,60,63,64
Gabon GAB M: 1967s, 2004n, 2007n, 2012n, 2013[2]s; MR: 2016na, 2018na, 2020na 28
Gambia, The GMB M: 1966s, 1967s, 1968s, 2003n, 2007n, 2011n; MR: 2015na, 2019na 28,6571
Ghana GHA M: 1967s, 2001s, 2002s, 2006n, 2010n; MR: 2013n, 2017na 28,7274,310
Guinea GIN M: 1967s, 2002s, 2003s, 2006n, 2009n, 2012n, 2015na; MR: 2018na 28
Guinea-Bissau GNB M: 1999s, 2003s, 2006n, 2009n, 2012n, 2015na; MR: 2018na 7577
Kenya KEN M: 1994s, 1999s, 2000s, 2002n, 2004s, 2005s, 2006[2]s, 2009n, 2012n; MR: 2015na, 2018na 7885
Lesotho LSO M: 1999s, 2000n, 2003n, 2007n, 2010n, 2013n; MR: 2016na, 2019na
Liberia LBR M: 1967s, 2004s, 2007n, 2008s, 2010n, 2011n; MR: 2017na, 2020na 28,86
Madagascar MDG M: 1998[2]s, 2004n, 2007n, 2010n, 2013n; MR: 2016na, 2019na 87
Malawi MWI M: 1998n, 1999s, 2002n, 2005n, 2008n, 2010n, 2013n; MR: 2016na, 2019na 35,88,89
Mali MLI M: 1967s, 1998s, 1999s, 2001n, 2004n, 2007n, 2011n, 2012[2]s; MR: 2017na, 2020na 28,90
Mauritania MRT M: 1967s, 1995n, 1997n, 1998[2]s, 1999n, 2000n, 2004n, 2008s, 2011[2]s, 2012s, 2014n; MR: 2017na, 2020na 28,91
Mauritius MUS M: 1998s; MR: 2003s
Mozambique MOZ M: 1997s, 1998s, 1999s, 2003[2]s, 2005n, 2008n, 2011n, 2013n; MR: 2016na, 2019na 88,9299
Namibia NAM M: 1997[2]s, 1998n, 2000n, 2003n, 2006s, 2009n, 2012n; MR: 2015na, 2018na 100
Niger NER M: 1967s, 1997s, 1998s, 1999s, 2004s, 2005s, 2008n, 2010s, 2012n, 2015na; MR: 2018na 28,101,102
Nigeria NGA M: 1967s, 1999s, 2005s, 2006s, 2007[2]s, 2008n, 2011n, 2013[3]s, 2014s, 2015na; MR: 2017na, 2019na 28,103110,311
Rwanda RWA M: 1999s, 2003n, 2006n, 2009n; MR: 2013n, 2017na 111
Sao Tome and Principe STP M: 1999n, 2007n, 2012n; MR: 2015n, 2018na
Senegal SEN M: 1967s, 2003n, 2006n, 2010[2]n; MR: 2013na, 2017na 28,112,312
Sierra Leone SLE M: 1967s, 2003n, 2006n, 2009n, 2012n; MR: 2015na, 2019na 28,113
South Africa ZAF M: 1996[2]s, 1997[2]s, 2000s, 2004n, 2005s, 2007n, 2009[3]s, 2010n, 2013n; MR: 2016na, 2019na 100,114
South Sudan SSD M: 1998s, 1999s, 2003s, 2004[4]s, 2005[3]s, 2006[2]s, 2007[2]s, 2008[3]s, 2010[2]s, 2011[2]n, 2012n, 2014n, 2014s, 2016na; MR: 2018na
Swaziland SWZ M: 1998n, 1999n, 2002n, 2006n, 2009n, 2010n, 2013n; MR: 2016na, 2019na
Togo TGO M: 1967s, 2001n, 2004n, 2008n, 2010n, 2013n; MR: 2016na, 2019na 28
Uganda UGA M: 1997s, 1998[2]s, 1999s, 2000[2]s, 2001s, 2003n, 2005s, 2006n, 2009n, 2012n, 2015na; MR: 2018na
United Republic of Tanzania TZA M: 1999[2]s, 2000s, 2001s, 2002s, 2005n, 2006n, 2008s, 2011n; MR: 2014n, 2018na 115
Zambia ZMB M: 1999s, 2002s, 2003s, 2007n, 2010n, 2012n 2015na; MR: 2018na, 2019na
Zimbabwe ZWE M: 1997s, 1998n, 2002n, 2003s, 2006n, 2009n, 2010n, 2012n; MR: 2015na, 2018na
Americas (AMR) 116119
Argentina ARG M: 1993n, 1998n; MR: 2002n, 2005n, 2006n, 2008n, 2009n 2014n 120,121
Bahamas, The BHS M: 1991n; MR: 1997[2]s, 2003n, 2006n, 2007n
Barbados BRB M: 1991n, 1996n; MR: 2004n, 2007n 122
Belize BLZ M: 1991n, 1993n, 1995n; MR: 2000n, 2004n, 2008n, 2010n
Bolivia BOL M: 1994n, 1998n, 1999s, 2000s, 2002s; MR: 2003n, 2004[2]s, 2005s, 2006n, 2007s; 2015na 123
Brazil BRA M: 1992n, 1995n, 1997[2]s, 1998s, 2000n; R: 2000s; MR: 2001s, 2002s, 2004n, 2008n, 2011n, 2014n 124126
Canada CAN M: 1996n 127
Chile CHL M: 1992n, 1996n, 1999n, 2001n; MR: 2005n, 2007n 128130
Colombia COL M: 1993n, 1995n, 2002n, 2003s; MR: 2005s, 2006[2]s, 2010n, 2011s 131
Costa Rica CRI M: 1967n; MR: 1993n, 1998n, 1999s, 2001n, 2002n 132134
Cuba CUB M: 1993[2]s, 2002n; R: 1982n; MR: 1986n, 2007n 135,136
Dominican Republic DOM M: 1993n, 1998n, 1999[2]s, 2001n, 2003n; MR: 2004[2]n, 2006n, 2010n 137,139
Ecuador ECU M: 1994n, 1998n, 2002n; MR: 2003n, 2004n, 2008n, 2009n, 2011n, 2012n 138
El Salvador SLV M: 1993n, 1996n, 1997s, 2001n, MR: 2004n, 2005n, 2006n, 2007n, 2008n, 2012[2]s 138
Grenada GRD M: 1991n, 1996n, 2001n
Guatemala GTM M: 1972–1979bn, 1993n, 1996n; MR: 2002n, 2003n, 2007n, 2008n, 2013n 139
Guyana GUY M: 1991n, 1996n, 2003n; MR: 2000n, 2007n 140142
Haiti HTI M: 1994n, 1999n, 2010s; MR: 2001n, 2002n, 2003n, 2004n, 2006n, 2007s, 2008s, 2012n, 2013[3]s, 2015na, 2018na 142
Honduras HND M: 1993n, 1996n, 2000n; MR: 2002n, 2003n, 2004n, 2008n, 2012[2]s 143
Jamaica JAM M: 1991n; MR: 1995n, 2000n, 2003s, 2004n, 2005n, 2006n, 2007n 144,145
Mexico MEX M: 1993n, 1998n; MR: 2002[2]s, 2004n, 2005n, 2006[3]s, 2008[2]s, 2010n, 2011n, 2012n, 2013n 146,147
Nicaragua NIC M: 1993n, 1996n, 1998n; MR: 2000n, 2002n, 2003n, 2004n, 2005[2]s, 2006n, 2008n, 2011n, 2012n
Panama PAN M: 1993n, 1996n, 2000n; MR: 2003n, 2006n, 2008n, 2010[2]s 148,149
Paraguay PRY M: 1995n, 1998n; MR: 2003n, 2005n, 2009[2]s, 2013s, 2014n 147
Peru PER M: 1992n, 1995n, 1997n, 2001n; MR: 2003[2]s, 2004n, 2006n, 2011n
St. Lucia LCA M: 1991n, 1996n 150
St. Vincent and the Grenadines VCT M: 1991n, 1995n
Suriname SUR M: 1991n, 1997n; MR: 2005n, 2007n, 2010n
Trinidad and Tobago TTO M: 1991n, 1997n 151,152
United States USA R:1970n
Puerto Ricoc
Uruguay URY M: 1994n, 1998[3]s; MR: 2003n, 2008n
Venezuela, RB VEN M: 1994n, 1998n; MR: 2001[2]s, 2002n, 2003[3]s, 2004s, 2005n, 2006n, 2007n, 2009[2]s, 2013n, 2014n 131,159,160
Eastern Mediterranean (EMR) 161163
Afghanistan AFG M: 1994s, 1995[2]s, 1996n, 1999s, 2002n, 2003n, 2006[2]s, 2007s, 2009n, 2011[3]s, 2012[2]s, 2013n, 2014[2]s, 2015na; MR: 2018na 164
Bahrain BHR MR: 1998n, 1999n 165,166
Djibouti DJI M: 2002s, 2003s, 2004s, 2005n, 2007s, 2008n, 2011n, 2012[2]s; MR: 2015na, 2019na
Egypt, Arab Rep. EGY M: 1998s, 2000s, 2002n; MR: 2008s, 2009s 167,168
Iran, Islamic Rep. IRN M: 1996s, 1999s; MR: 2003n, 2007[2]s, 2010s, 2012s 169,170
Iraq IRQ 1995n, 2002n, 2009[5]s, 2010[2]s, 2011s, 2012s, 2013; MR: 2004[3]s, 2005[2]s, 2006s, 2007n, 2008[5]s 171
Jordan JOR M: 1997n, 1999n, 2003s; MR: 2004s, 2005n, 2012s, 2013[2]s 172
Kuwait KWT M: 1994n; MR: 1998n, 2010s 173
Lebanon LBN M: 1978n, 1990n, 1994n; MR: 2000n, 2008s, 2013s
Libya LBY MR: 2005n, 2008[2]s, 2009[2]s
Morocco MAR MR: 2008[2]s, 2013n, 2016na 174
Oman OMN MR: 1994n 175177
Pakistan PAK M: 2005s, 2007[4]s, 2008s, 2010[3]s, 2011[5]s, 2012n, 2013[2]s, 2014[3]s; MR: 2017na, 2020na
Qatar QAT MR: 2000n, 2005n, 2007n
Saudi Arabia SAU MR: 1998n, 2000s, 2004n, 2007n, 2011[2]n 178
Somalia SOM M: 2002s, 2005s, 2006s, 2007s, 2008[2]s, 2009[3]s, 2010n, 2011[8]s, 2012[3]s, 2013s, 2014s; MR: 2016na, 2018na, 2020na 179
Sudan SDN M: 1998s, 1999s, 2003s, 2004[4]s, 2005[3]s, 2006[2]s, 2007[2]s, 2008[3]s, 2010[2]s, 2011[5]s, 2012s, 2013s; MR: 2016na, 2019na
Syrian Arab Republic SYR M: 2003s, MR: 1998n, 2004s, 2005s, 2007[2]s, 2008n, 2009s, 2012n, 2013[2]s, 2014n
Tunisia TUN M: 1998n, 2001n, 2002n; MR: 2005 180,181
United Arab Emirates ARE MR: 1998n, 1999n, 2001n 182
Yemen, Rep. YEM M: 2001s, 2004s, 2005s, 2006s, 2007s, 2009[2]s, 2010s, 2011s, 2012n, 2013s; MR: 2014n, 2017na, 2020na
Europe (EUR) 183188,313,314
Albania ALB M: 1970–1989bn; MR: 2000n, 2002n, 2003 189
Armenia ARM M: 2008n; MR: 2007 190
Austria AUT
Azerbaijan AZE M: 2004n; MR: 2006[2]s, 2014n 190
Belarus BLR M: 2012n; R: 2005s, 2006n 190,194
Belgium BEL
Bosnia and Herzegovina BIH
Bulgaria BGR MR: 2009n, 2010s 198
Croatia HRV
Cyprus CYP
Czech Republic CZE
Denmark DNK MR: 2012n 202
Estonia EST
Finland FIN
France FRA
Georgia GEO M: 2004s; MR: M: 2004[4]s, 2005n, 2008[2]s, 2013n 209
Germany DEU
Greece GRC
Hungary HUN M: 1969n, 1970n, 1971n, 1973[2] n, 1974[2]n 216
Iceland ISL
Ireland IRL MR: 2009n 218,219
Israel ISR
Italy ITA MR: 2007s 222,223
Kazakhstan KAZ MR: 2005n 190,224
Kyrgyz Republic KGZ MR: 2001n, 2002s 190,225,226
Latvia LVA
Lithuania LTU
Luxembourg LUX
Macedonia, FYR MKD MR: 2009n 196,229
Malta MLT
Moldova MDA MR: 2002[2]s 190
Montenegro MNE
Netherlands NLD
Norway NOR
Poland POL
Portugal PRT
Romania ROU M: 1979–1989dn; MR: 1998n, 2010n, 2011[2]s 236,237
Russian Federation RUS M: 2004s, 2005n, 2008n, 2010s 190
Serbia SRB MR: 2003s, 2004[2]s, 2005s 238
Slovak Republic SVK M: 2002n; MR: 2003s 201
Slovenia SVN
Spain ESP
Sweden SWE
Switzerland CHE
Tajikistan TJK M: 2004n; MR: 2009n 190
Turkey TUR M: 1985n, 2003[2]s, 2004s, 2005s 249251
Turkmenistan TKM MR: 2007n 190
Ukraine UKR MR: 2008n 190,252
United Kingdom GBR M: 1994n; MR:1994n, 2004s 253256
Uzbekistan UZB MR: 2006s, 2007s, 2011n 257,258
Southeast Asia (SEAR) SEAR
Bangladesh BGD M: 1995s, 1998s, 1999s, 2001s, 2005s, 2006s, 2010n; MR: 2014n, 2018na 259
Bhutan BTN M: 1995n, 1996s, 2000s; MR: 2006n 260
India IND M: 1995s, 1996s, 1997s, 1999s, 2000s, 2001s, 2010s, 2011[2]s, 2012[2]s, 2013n 261,262
Indonesia IDN M: 1997s, 2000[2]s, 2002[2]s, 2003s, 2004s, 2005[2]s, 2006[3]s, 2007[4]s, 2008s, 2009[3]s, 2010s, 2011s; MR: 2016na, 2017na, 2018na 263
Korea, Dem. Rep. PRK M: 1995s, 1999n, 2007n
Maldives MDV M: 1995n, 1996n, 1997s; MR: 2005n, 2006n, 2007n
Myanmar MMR M: 1995s, 1996s, 1997[2]s 2002s, 2003s, 2004s, 2007n, 2012n; MR: 2015na 264
Nepal NPL M: 1995n, 2004n, 2005[2]s, 2008[3]s; MR: 2012[3]s, 2015na, 2018na
Sri Lanka LKA M: 2003s, 2013s; MR: 2004n 265
Thailand THA
Timor-Leste TLS M: 2003n, 2006n, 2009n, 2011n; MR: 2015na, 2020na
Western Pacific (WPR) 270,271
Australia AUS M: 1998n 272,273
Brunei Darussalam BRN
Cambodia KHM M: 2000n, 2001[2]s, 2002n, 2003n, 2004n, 2005n, 2007n, 2011[2]s; MR: 2013n, 2017na
China CHN M: 2003s, 2004s, 2005[4]s, 2006s, 2007s, 2008[2]s, 2009[2]s, 2010n; MR: 1998s, 1999s 274276
Hong Kong SAR, Chinac HKG M: 1997s; MR: 2002n 315
Macao SAR, Chinac MAC MR: 20011n
Fiji FJI M: 1997n, 2001n; MR: 2006n, 2011 280,281
Japan JPN
Korea, Rep. KOR M: 2001n, 2004n, 2005n; MR: 2006n, 2007n, 2008n, 2009n 285,286
Lao PDR LAO M: 1998s, 2000s, 2001s, 2007n; MR: 2011s, 2012s, 2014n, 2017na, 2020na 287,288
Malaysia MYS M: 2004n, 2005n; R: 1989n; MR: 2012[3]n, 2012[3]s 289293
Micronesia, Fed. Sts. FSM MR: 2004s, 2010s: 2011s, 2013s, 2014[3]s 294
Mongolia MNG M: 1994n, 1996n, 2000n, 2001s, 2007n; R: 2009s; MR: 2012n
New Zealand NZL MR: 1997n, 1998n 295,296
Papua New Guinea PNG M: 1997n, 2003s, 2004s, 2005s, 2009s, 2010n, 2012n; MR: 2015na, 2018na 297299
Philippines PHL M: 1998n, 2002s, 2004n, 2007n, 2009s, 2010s, 2013[2]s, 2014s; MR: 2011n, 2014na, 2018na
Samoa WSM M: 1998n, 2001n; MR: 2003n, 2008n, 2009n
Singapore SGP
Solomon Islands SLB M: 1997n, 1998n, 2001n, 2006n, 2009n; MR: 2012n, 2014, 2018na
Tonga TON M: 1998n, 2001n
Vanuatu VUT M: 1998n, 2001n, 2006n, 2009n; MR: 2013n, 2014n
Vietnam VNM M: 1993n, 1994[2]s, 1995[2]s, 1996[2]s, 1997[2]s, 1998[2]s, 1999s, 2001s, 2002s, 2003s, 2004s, 2005s, 2007s, 2008s, 2010n, 2013s; MR: 2014[2]n
a

Assumption about future SIAs.

b

Annually for all of the years listed (between and including the years listed).

c

WHO nonmember.

d

Two times per year for all of the years listed (between and including the years listed), SIAs for years 1994–1998 included booster dose given to school-age children during one of the two SIAs.

Figs. 18 show the full profiles for the United States, the Netherlands, Japan, Oman, Vietnam, Kenya, Ethiopia, and Haiti, respectively, as examples. Part (a) in each profile shows the historical RI coverage estimates by year and schedule. The RI schedule includes the age and the antigens in the vaccine (i.e., M for measles vaccine, R for rubella vaccine, and MR for any combination vaccine including both antigens). We use colors (visible in the on-line version) to show different vaccines and/or schedules. If introduction of the vaccine occurred after January in a year, then we estimated the coverage for the full year adjusting for the fraction of the year with introduction. Thus, when the country switched from a MCV to a MRCV after January of a year, we showed the M and R coverage for the year separately, which makes the R value appear as a single point (e.g., Fig. 2a or 4a). The SIAs for each country appear in Table II. Parts (b) and (c) of the profile show the reported measles and rubella cases, respectively, and prior model estimates (if available) for comparison for relevant time periods.(5) We provide access to the full profiles for all of the 183 modeled areas on the Kid Risk website.(23)

Fig. 1.

Fig. 1.

Profile for the United States.

Fig. 8.

Fig. 8.

Profile for Ethiopia.

Fig. 2.

Fig. 2.

Profile for the Netherlands.

Fig. 4.

Fig. 4.

Profile for Oman.

The profiles show a wide range of immunization schedules and coverage that evolved over time, and highly variable epidemiological experience with measles and rubella cases. Comparing the figures for coverage levels and incidence overall suggests that increased immunization coverage significantly decreases incidence. However, as coverage increases to high levels, as occurred in the United States, the Netherlands, Japan, and Oman, the incidence data do not show complete disappearance of cases due to importations. In the United States, heterogeneity in immunization coverage continues to lead to outbreaks following the importation of measles,(24,25) although these cases appear barely visible in Fig. 1b compared to historical incidence. In the United States, aggressive outbreak response efforts control outbreaks relatively quickly. Starting the x-axis scale in 1998 in Fig. 1c for rubella for the United States misses the impact of heterogeneity and the outbreaks of rubella that occurred in the Amish in the early 1990s,(26) but uses a y-axis scale large enough that the relatively small number of annual importation-related cases appear barely visible. Fig. 4c for the much smaller total population in Oman shows the relatively small number of cases primarily from importations it reports annually. In contrast, Figs. 2b and 2c show episodic outbreaks in the Netherlands, which reflect the significant impacts of clustering of its under-vaccinated religious subpopulation. In Japan, rubella immunization initially targeted adolescent girls only, which did not eliminate rubella transmission in the general population. Difficulties due to the mumps antigen following the introduction of MMR around 1990 in Japan led to heterogeneity in coverage of M and R in RI, and the buildup of susceptible individuals, who supported outbreaks in the early 2000s and 2010s. Figs. 5b and 5c for Haiti show the impact of the aggressive efforts by the WHO Region of the Americas (i.e., PAHO) to use wide age range SIAs to eliminate measles and rubella, which in contrast to> Fig 6b shows the decreasing measles incidence with improved coverage and late introduction of MCV2 into RI in Vietnam. Figs 6c, 7c, and 8c show reported incidence of rubella, although this probably reflects underreporting given the absence of RCV use.

Fig. 5.

Fig. 5.

Profile for Haiti.

Fig. 6.

Fig. 6.

Profile for Vietnam.

Fig. 7.

Fig. 7.

Profile for Kenya.

4. DISCUSSION

Our efforts to synthesize the available immunization and epidemiological data for measles and rubella at the national level provide a foundation for modeling measles and rubella transmission globally. Significant variability in the profiles suggests the need to model transmission of measles and rubella at the national level for larger-scale analyses and then aggregate the results to the regional or global level. We expect that our analysis should facilitate such modeling. The syntheses reveal potential immunity gaps, with low vaccination coverage in some years translating into relatively large proportions of accumulating susceptible individuals in the absence of SIAs to catch up unimmunized individuals. In some cases, outbreaks probably led to immunity in some fraction of the unimmunized individuals. Immunization program managers must manage population immunity to stop transmission, and these profiles may serve as a reminder about potentially accumulating susceptible individuals due to relatively low coverage in the past. Social disruptions (e.g., natural disasters, conflict) negatively impact national immunization programs, and catching up individuals missed due to such disruptions should represent a priority for national efforts to close immunity gaps.

The comparisons between the reported cases and cases estimated by prior models demonstrate the absence of prior model estimates for some countries. We identified historical reported cases before 1974 for only a relatively small number of high-income member states (e.g., the United States, the United Kingdom). We encountered the most difficulty finding information about rubella cases, particularly in Africa, and we suspect that member states most likely reported some of the historical rubella cases as measles cases due to the similarity of the clinical presentation. Increased use and expansion of laboratory methods that characterize both viruses promise to provide better information in the future.

Despite our extensive efforts, several data gaps remain. We could not find complete information for most of the 183 areas. We found conflicting information for some areas, and we did our best to resolve this using the available literature. Our efforts to reconstruct historical experiences did not benefit from review by national experts. In addition to concerns and limitations associated with underreported incidence, incorrect reporting of coverage also represents a concern. Underreporting of coverage, perhaps due to vaccine delivered in the private sector, may suggest immunity gaps that do not exist. A much larger concern, however, comes from overreporting of coverage, which may provide a false sense of security about the absence of immunity gaps. The use of the data in this synthesis comes with many limitations due to unknown and potentially poor data quality. We hope that this effort will motivate national experts to provide corrections to our assumptions such that modeling efforts can benefit from the best available information.

This synthesis of the available data should provide a useful starting point for measles and rubella transmission models and help to make assumptions about immunization inputs more transparent.

Fig. 3.

Fig. 3.

Profile for Japan.

ACKNOWLEDGMENTS

The first two authors acknowledge support for this work from the U.S. Centers for Disease Control and Prevention (CDC) for supporting this work under Cooperative Agreement U66IP000519. We thank Marta Gacic-Dobo and Tony Burton for helpful input. The contents of this article remain solely the responsibility of the authors and do not represent the official views of the U.S. Centers for Disease Control and Prevention or the World Health Organization.

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