Sero-survey of polio antibodies and quality of acute flaccid paralysis surveillance in Chongqing, China: A cross-sectional study

Serums were collected from people to assess whether polio immunity level was high enough to satisfy the polio vaccine immunization switch in Chongqing. People in 7 age groups (
Source: Medicine - Category: Internal Medicine Tags: Research Article: Observational Study Source Type: research