Poliovirus containment: guidance to minimize risk for facilities collecting, handling or storing materials potentially infectious for polioviruses: web annex A: country and area specific poliovirus data, April 2023 update, 2nd ed

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World Health Organization. (2023). Poliovirus containment: guidance to minimize risk for facilities collecting, handling or storing materials potentially infectious for polioviruses: web annex A: country and area specific poliovirus data, April 2023 update, 2nd ed. World Health Organization. https://iris.who.int/handle/10665/371662. License: CC BY-NC-SA 3.0 IGO