According to WHO, three laboratory-confirmed cases of circulating vaccine-derived poliovirus type 2 (cVDPV2) were reported in the Biombo and Bissau regions on October 26, 2021. The most recent date of symptom onset was July 15, 2021. The detected cVDPV strain is genetically linked to a strain circulating in Nigeria. cVDPV had not previously been detected in Guinea-Bissau.
Consequences for the traveler
Guinea-Bisseau is now considered as category 2 of the WHO temporary poliomyelitis vaccination recommendations ("States infected with cVDPV2, with or without evidence of local transmission"):
- On departure from Guinea-Bisseau, persons with residence in the country for >4 weeks are strongly recommended to have received a polio booster vaccine (IPV) no longer than 12 months ago with documentation in their 'International Certificate for Vaccination' (according to WHO, 20.8.2021).
- Stays < 4 weeks: in addition to the basic immunisation against polio, a booster vaccination is recommended every 10 years (recommendation of the Swiss Expert Committee for Travel Medicine (ECTM).