Date: Wed 11 Dec 2019
Source: UNICEF/WHO Situation report 11 Dec 2019 [edited]
- 5 new human cases reported in the past week
- In response to 1st human vaccine-derived poliovirus type 1 (VDPV1) case from the island province of Basilan, in the Bangsamoro Autonomous Region in Muslim Mindanao (BARMM), outbreak immunization was conducted
in Maluso, Basilan, with bivalent oral polio vaccine (bOPV) against polio type 1, vaccinating 13 547 children under 10 years old (102% of the target).
- Currently 9 human cases confirmed with circulating VDPV type 2 (cVDPV2), 1 case with VDPV1, 1 case with cVDPV1, and 1 case with immunodeficiency-related VDPV type 2 (iVDPV2).
- A case with VDPV1 from Sultan Kudarat is pending genetic analysis; 1 case of cVDPV1 from Malaysia was confirmed as genetically linked to the Basilan case.
- Synchronized polio vaccination campaign conducted on [25 Nov 2019 - 10 Dec 2019] (including 2 days of extension) vaccinated 4 309 566 children under 5, which is 98% of the target total of 4.4 million children under 5. A total of 1 395 365 children under 5 were vaccinated in National Capital Region (NCR), which is 109% of the target, and 2 914 201 (94%) in Mindanao.
- DOH planning to conduct outbreak immunization with bOPV targeting 710,296 children under 10 in the Sulu Archipelago, Zamboanga City, and Lambayong, Sultan Kudarat, on [6-12 Jan 2020].
- Current polio outbreak resulting from persistently low routine immunization coverage, and poor sanitation and hygiene.
- Philippines is affected by both cVDPV1 and cVDPV2. cVDPV is considered a public health emergency of international concern (PHEIC).
- In response to the 1st human case confirmed with VDPV1 from Maluso, Basilan (BARMM), outbreak immunization was conducted in the area with bOPV for children under 10 years old, vaccinating 13,547 children under 10 years of age (102% of the target).
- A cVDPV1 case in Sabah state, Malaysia, was confirmed to be genetically linked to the Basilan case by the Victorian Infectious Diseases Reference Laboratory (VIDRL) in Australia. Since the 2 viruses are genetically linked, they are both classified as circulating.
- A new VDPV1 case from Sultan Kudarat (Region XII) was confirmed on [6 Dec 2019] and is pending further genetic analysis.
- All 13 cVDPV1 environmental samples found in Manila are genetically linked.
- All 9 human cases and 17 environmental samples confirmed with cVDPV2 are genetically linked. All human cases were reported from Mindanao (BARMM and Region XII), whereas environmental samples were found in NCR and Davao.
- All samples were tested by the National Polio Laboratory at the Research Institute for Tropical Medicine (RITM), whereas sequencing and genetic analysis is done at the NIID in Japan, and additional genetic characterization is provided by the United States Centers for Disease Control and Prevention (CDC).
[Given the identification of the cVDPV1 case in Malaysia that is genetically related to the VDPV1 case in Basilan, it is now clear there are at least 2 separate cVDPV outbreaks in the Mindinao region of the Philippines: one of the outbreaks is associated with cVDPV2, and the other with cVDPV1 and one outbreak of cVDPV1 in the Manila Metropolitan area (although only environmental samples have been positive without AFP (acute flaccid paralysis) cases as yet.) What all these areas have in common is pockets of populations with suboptimal vaccination coverages. Clearly, we await further information on the genetic profiling of the newly identified VDPV1 case in Sultan Kudarat, also located in southern Philippines. Note that Basilan Island, Sultan Kudarat, and Sabah state in Malaysia, while all in the same general area, are not contiguous, each being on a different island. In. total, there are 11 cases of AFP in the Philippines that are attributable to infection with a VDPV.
A map showing the provinces in the Philippines can be found at
HealthMap/ProMED-mail map of the Philippines: