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Vaccine-derived poliovirus detected in Burundi, Congo
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The detections are significant as they are the first linked with the use of a new vaccine, the novel oral poliomyelitis vaccine type 2, which was developed to reduce this risk.
Five other samples from environmental surveillance of wastewater confirmed the presence of circulating poliovirus type 2 in Burundi, the WHO added in a statement.
Circulating poliovirus type 2 is different to wild poliovirus, with infections occurring when a weakened strain of poliovirus contained in the oral polio vaccine circulates among under-immunized populations for long periods.
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