Risk factors for the spread of vaccine-derived type 2 polioviruses after global withdrawal of trivalent oral poliovirus vaccine and the effects of outbreak responses with monovalent vaccine: a retrospective analysis of surveillance
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Correlation between polio immunization coverage and overall morbidity and mortality for COVID-19: an epidemiological study | SpringerLink
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IJERPH | Free Full-Text | Correlation between Non-Polio Acute Flaccid Paralysis Rates with Pulse Polio Frequency in India
Polio in Afghanistan: The Current Situation amid COVID-19 in: The American Journal of Tropical Medicine and Hygiene Volume 103 Issue 4 (2020)