TABLE. Vaccination activities in response to an outbreak of circulating vaccine-derived poliovirus type 2 — Syria, 2017–2018.
| Governorate/Vaccine type | Target age group (mos) | Outbreak response phase 1 | Outbreak response phase 2 | ||||
|---|---|---|---|---|---|---|---|
| Round 1 | Round 2 | Round 3 | |||||
| Administrative coverage* (%) | PCM† (recall) (%) | Administrative coverage* (%) | PCM† (recall) (%) | Administrative coverage* (%) | PCM† (recall) (%) | ||
| Deir-ez-Zor | |||||||
| mOPV2 | <60 | 79 | 88 | 77 | 77 | 79 | 90 |
| IPV | 2–23 | — | — | 71 | 80 | — | — |
| Raqqa | |||||||
| mOPV2 | <60 | 86 | 57 | 114 | 84 | 86 | 84 |
| IPV | 2–23 | — | — | 50 | 50 | — | — |
| Hasakeh § | |||||||
| mOPV2 | <60 | — | — | — | — | 77 | 91 |
| IPV | 2–23 | — | — | — | — | 95 | 85 |
Abbreviations: IPV = inactivated poliovirus vaccine (contains types 1, 2, and 3); mOPV2 = monovalent oral poliovirus vaccine type 2; PCM = postcampaign monitoring.
* Administrative coverage was calculated using denominators for the target age group provided by official sources. These denominators might not have reflected the actual target population because of frequent population movement to and from the outbreak-affected area.
† Postcampaign monitoring is often considered a more accurate measure of vaccination coverage than administrative data and was estimated using cluster and market surveys administered by independent monitors to parents of children within the target age group.
§ Although no case was identified in Hasakeh governorate, it was included in response activities because of its geographic proximity to the outbreak-affected area.