Poland urges polio vaccinations for children after the virus is detected in Warsaw sewage
About 86 per cent of the country's three-year-olds have been vaccinated against polio, shy of the 95 per cent recommended to prevent the spread of the virus.
About 86 per cent of the country's three-year-olds have been vaccinated against polio, shy of the 95 per cent recommended to prevent the spread of the virus.
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