Table 3.
cVDPV2 outbreaks and viruses detected after the switch from trivalent OPV to bivalent OPV, by WHO region and country — worldwide, 2016–2020.
| WHO Region & Subregion | Country | No. Outbreaks | No. Confirmed AFP Cases | No. Confirmed ES Isolates | No. Confirmed Healthy or Community Contacts | No. Total Viruses Detected |
|---|---|---|---|---|---|---|
| AFR | 82 | 977 | 483 | 470 | 1930 | |
| Central | 38 | 498 | 67 | 253 | 818 | |
| Angola | 5 | 141 | 21 | 22 | 184 | |
| Cameroon | 4 | 7 | 13 | 4 | 24 | |
| CAR | 8 | 25 | 17 | 44 | 86 | |
| Chad | 3 | 112 | 14 | 23 | 149 | |
| Congo (Rep.) | 3 | 2 | 1 | 2 | 5 | |
| DRC | 15 | 211 | 1 | 158 | 370 | |
| Eastern & Southern | 16 | 103 | 17 | 40 | 160 | |
| Ethiopia | 10 | 50 | 7 | 16 | 73 | |
| Kenya1 | 2 | 0 | 2 | 1 | 3 | |
| Mozambique | 1 | 1 | 0 | 2 | 3 | |
| South Sudan | 1 | 50 | 8 | 19 | 77 | |
| Zambia | 2 | 2 | 0 | 2 | 4 | |
| West | 28 | 376 | 399 | 177 | 952 | |
| Benin | 1 | 11 | 7 | 0 | 18 | |
| Burkina Faso | 2 | 66 | 0 | 12 | 78 | |
| Côte d'Ivoire | 2 | 64 | 158 | 24 | 246 | |
| Ghana | 1 | 30 | 55 | 26 | 111 | |
| Guinea | 1 | 44 | 1 | 1 | 46 | |
| Liberia | 1 | 0 | 7 | 2 | 9 | |
| Mali | 2 | 52 | 4 | 3 | 59 | |
| Niger2 | 2 | 21 | 9 | 13 | 43 | |
| Nigeria | 12 | 61 | 157 | 80 | 298 | |
| Senegal | 1 | 0 | 1 | 0 | 1 | |
| Sierra Leone | 1 | 10 | 0 | 6 | 16 | |
| Togo | 2 | 17 | 0 | 10 | 27 | |
| EMR | 25 | 622 | 437 | 122 | 1181 | |
| Afghanistan | 3 | 308 | 182 | 37 | 527 | |
| Egypt | 1 | 0 | 1 | 0 | 1 | |
| Iran (Islamic Republic of) | 1 | 0 | 3 | 0 | 3 | |
| Pakistan | 15 | 158 | 179 | 16 | 353 | |
| Somalia | 3 | 23 | 58 | 15 | 96 | |
| Sudan | 1 | 59 | 14 | 11 | 84 | |
| Syrian Arab Republic | 1 | 74 | 0 | 43 | 117 | |
| EUR | 1 | 1 | 0 | 0 | 1 | |
| Tajikistan | 1 | 1 | 0 | 0 | 1 | |
| WPR | 3 | 14 | 33 | 9 | 56 | |
| China | 1 | 1 | 1 | 3 | 5 | |
| Malaysia | 1 | 0 | 8 | 0 | 8 | |
| Philippines | 1 | 13 | 24 | 6 | 43 | |
| All Regions | 111 | 1614 | 953 | 601 | 3168 |
Abbreviations: AFP, Acute Flaccid Paralysis; AFR, African Region; CAR, Central African Republic; DRC, Democratic Republic of the Congo; EMR, Eastern Mediterranean Region; ES, Environmental Sample; EUR, European Region; WPR, Western Pacific Region.
1
Two outbreaks of SOM-BAN-1 in Kenya: 1st outbreak: 2018; 2nd outbreak: 2020–2021.
2
Two outbreaks of NIE-JIS-1 in Niger: 1st outbreak: 2018–2019; 2nd outbreak: 2020.