Continuing surveillance of families for studying the epidemiology of viral infections.
D000257:Adenoviridae Infections / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008145:Louisiana; D008297:Male; D009518:New York; D011051:Poliomyelitis / Q000453:epidemiology; D011159:Population Surveillance; D012141:Respiratory Tract Infections / Q000453:epidemiology; D014777:Virus Diseases / Q000453:epidemiology* / Q000235:genetics; D014861:Washington