Why the study?
Nation-wide surveillance was conducted to identify acute flaccid paralysis in children so that potential wild polioviruses and vaccine-derived poliovirus could be detected on time.
High-quality surveillance in China from 1995 to 2019 permitted early detection of type I vaccine-derived polioviruses, stalling widespread circulation.
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Highlights importance of robust VDPV surveillance for containment; leaves open optimal strategies for under-surveilled regions.
Zhang et al. (2019) studied this question.
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