![]() ![]() Here, we analyzed the epidemiology of prolonged and chronic immunodeficiency-related vaccine-derived poliovirus cases in a registry maintained by the World Health Organization, to identify risk factors and determine the length of excretion. Individuals with primary immunodeficiency disorder may excrete poliovirus for extended periods and will constitute the only remaining reservoir of virus after eradication and withdrawal of oral poliovirus vaccine. 4Taskforce for Child Health, Atlanta, GA, United States.3Centers for Disease Control and Prevention, Atlanta, GA, United States. ![]()
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