The detection of genetically linked cVDPV3s in wastewater in French Guiana—where oral polio vaccine is not used—demonstrates the critical role of environmental surveillance in identifying silent poliovirus importation and circulation to guide public health catch-up immunisation campaigns.
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Environmental detection of imported cVDPV3 warrants sustained surveillance; leaves open transmission dynamics and eradication response needs.
Circulating type 3 vaccine-derived polioviruses (cVDPV3s) were detected in three wastewater samples collected in French Guiana from May through August 2024. As the oral polio vaccine is not used in French Guiana, this event involved an import either of cVDPV3s themselves or of a vaccine strain from which the cVDPV3s emerged in French Guiana. This highlights the importance of environmental surveillance for the detection of silent poliovirus circulation. Eliminating any pockets of cVDPVs is crucial for the polio eradication programme.
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Raffestin et al. (2024) studied this question.
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