
This study aimed to evaluate the effect of immunization with bivalent Oral Poliovirus Vaccine (bOPV) on the incidence of COVID-19 and other acute respiratory infections (ARIs). The number of laboratory-confirmed cases of COVID-19 was significantly lower in the vaccinated group than in the placebo. The findings are in line with previous observations of the protective effects of OPV against seasonal influenza and other viral and bacterial pathogens.
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