Why the study?
Wild poliovirus importation from endemic regions and high circulation of vaccine-derived poliovirus type 2 prompted environmental monitoring for enteroviruses in Mozambique.
Environmental surveillance in Maputo, Mozambique in 2018 detected high circulation of non-polio enteroviruses but no wild or vaccine-derived poliovirus.
Supports intensified wastewater surveillance in high-risk regions; leaves open its predictive value for clinical outbreaks.
Due to the possibility of wild poliovirus importation from endemic regions and the high circulation of vaccine-derived poliovirus type 2 in the African region, Mozambique implemented a surveillance program to monitor the circulation of enteroviruses in the environment. From January to November 2018, a period that immediately preceded the cVDPV outbreak in Africa, 63 wastewater samples were collected from different areas in Maputo city. A total of 25 samples (39.7%) were positive based on cell culture isolation. Non-polio enteroviruses were found in 24 samples (24/25; 96%), whereas 1 Sabin-related poliovirus was isolated. Neither wild nor vaccine-derived poliovirus was detected. High circulation of EVB species was detected. Environmental surveillance in the One Health approach, if effectively applied as support to acute flaccid paralysis, can be a powerful aid to the public health system to monitor poliovirus besides non-polio enteroviruses in polio-free areas.
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Bero et al. (2022) studied this question.
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