Population
86 persons from a Gypsy community in Italy
Design
Cross-sectional
Authors
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High seroprevalence despite low documented coverage warrants continued vigilance; leaves open whether secondary spread or undetected circulation is occurring.
High levels of poliovirus immunity in an underimmunized community suggest secondary spread of vaccine virus or unrecognized wild poliovirus circulation, highlighting the need for targeted immunization.
Aylward et al. (1997) studied this question.
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