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Ctr Dis Control & Prevent, Viral Gastroenteritis Sect, Div Viral & Rickettsial Dis, Publ Hlth Serv,US DHHS, Atlanta, GA 30333 USA Ctr Dis Control & Prevent, Viral Gastroenteritis Sect, Div Viral & Rickettsial Dis, Publ Hlth Serv,US DHHS, Atlanta, GA 30333 USA