Wild poliovirus imported into Qinghai province, China.
D002681:China / Q000453:epidemiology; D006801:Humans; D007114:Immunization; D007223:Infant; D008297:Male; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000821:virology*; D011159:Population Surveillance