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US officials say 2 more places will test sewage for polio
US officials say 2 more places will test sewage for polio,Philadelphia and Oakland County, Michigan, are joining the small list of U.S. localities that are looking for signs of polio infections in sewage

US officials say 2 more places will test sewage for polio

Philadelphia and Oakland County, Michigan, are joining the small list of U.S. localities that are looking for signs of polio infections in sewage