TABLE 2.
Characteristics of measles supplementary immunization activities (SIAs),*† by year and member state— World Health Organization African Region, 2011 and 2012
| Year | Member state§ | Age group targeted (mos) | Children reached (administrative coverage) in targeted age group | Proportion of districts with ≥95% coverage (%) | Post-SIA coverage survey (%) | Other interventions | |
|---|---|---|---|---|---|---|---|
|
| |||||||
| No. | (%) | ||||||
| 2011 | Angola | 9–59 | 4,635,248 | (85) | (17) | OPV, vitamin A, anthelminthics | |
| Benin | 9–59 | 1,411,065 | (104) | (93) | (83) | ||
| Burkina Faso | 9–59 | 2,865,517 | (113) | (100) | |||
| Central African Republic | 9–47 | 515,452 | (84) | (33) | OPV, vitamin A, anthelminthics | ||
| Cote d’Ivoire | 9–59 | 5,820,653 | (95) | (72) | (91) | OPV | |
| DRC | |||||||
| 6–59 | 7,368,047 | (98) | |||||
| 6–179 | 9,280,981 | (100) | |||||
| Equatorial Guinea | 9–47 | 11,658 | (50) | ||||
| Ethiopia | (91) | (88) | OPV, vitamin A, anthelminthics | ||||
| Rollover campaigns¶ | 9–47 | 757,421 | (98) | ||||
| Outbreak response immunization | 6–179 | 7,034,264 | (96) | ||||
| Gambia | 9–59 | 307,613 | (95) | (31) | (93) | Vitamin A | |
| Liberia | 6–59 | 572,981 | (103) | (60) | (99) | OPV, vitamin A, anthelminthics | |
| Mali | 9–59 | 4,616,957 | (94) | (62) | |||
| Mauritania | 9–59 | 510,155 | (96) | (90) | |||
| Mozambique | 6–59 | 3,985,564 | (104) | (86) | (81) | OPV, vitamin A, anthelminthics | |
| Nigeria | 9–59 | 28,435,589 | (100) | (52) | (94) | OPV, vitamin A, anthelminthics | |
| Tanzania | 9–59 | 6,686,663 | (97) | (60) | (92) | OPV and tetanus toxoid vaccine, vitamin A, anthelminthics | |
| 2012 | Burundi | 6–59 | 1,459,304 | (102) | (82) | Vitamin A, anthelminthics | |
| Cameroon | 9–59 | 3,562,478 | (102) | (78) | (78) | OPV, vitamin A, anthelminthics | |
| Chad | 9–59 | 2,270,772 | (111) | (83) | OPV | ||
| DRC | |||||||
| 6–59 | 2,972,570 | (104) | |||||
| 6–179 | 3,605,069 | (101) | |||||
| Equatorial Guinea | 9–59 | 49,578 | (58) | ||||
| Eritrea | 9–47 | 277,928 | (74) | (16) | (96) | Vitamin A | |
| Gabon | 6–59 | 169,999 | (67) | (20) | Vitamin A, anthelminthics | ||
| Guinea | 9–59 | 2,275,245 | (103) | (92) | (91) | OPV | |
| Guinea-Bissau | 9–59 | 220,826 | (89) | (18) | (68) | Vitamin A, anthelminthics | |
| Kenya | 9–59 | 5,554,153 | (92) | (64) | (88) | OPV, vitamin A | |
| Namibia | 9–179 | 885,259 | (91) | (100) | (89) | OPV and tetanus toxoid vaccine, vitamin A, anthelminthics | |
| Niger | 9–179 | 7,780,724 | (100) | (93) | (97) | Anthelminthics | |
| Sao Tome and Principe | 9–59 | 22,476 | (105) | (100) | |||
| Sierra Leone | 9–59 | 1,179,605 | (102) | (100) | (96) | Vitamin A, anthelminthics | |
| Uganda | 6–59 | 6,283,441 | (100) | (73) | (95) | OPV, vitamin A, anthelminthics | |
| Zambia | 9–179 | 7,503,515 | (116) | (93) | (96) | OPV, vitamin A, anthelminthics | |
| Zimbabwe | 6–59 | 1,613,437 | (103) | (84) | (95) | OPV, vitamin A | |
Abbreviations: OPV = oral poliovirus vaccine; DRC = Democratic Republic of the Congo.
Data available at http://www.who.int/immunization/monitoring_surveillance/data/subject.
SIAs generally are carried out using two approaches. An initial, nationwide catch-up SIA targets all children aged 9 months-14 years; it has the goal of eliminating susceptibility to measles in the general population. Periodic follow-up SIAs then target all children born since the last SIA. Follow-up SIAs generally are conducted nationwide every 2–4 years and generally target children aged 9–59 months; their goal is to eliminate any measles susceptibility that has developed in recent birth cohorts and to protect children who did not respond to the first measles vaccination. The exact age range for follow-up SIAs depends on the age-specific incidence of measles, coverage with measles-containing vaccine through routine services, and the time since the last SIA.
Type of SIA is national if not indicated otherwise.
Rollover campaigns were conducted in phases and spread out during >1 calendar year.