Helicobacter pylori positivity in asymptomatic children of different ethnic groups living in the same country.
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D005260:Female; D016481:Helicobacter Infections / Q000208:ethnology*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007223:Infant; D008297:Male; D016036:Seroepidemiologic Studies; D013019:South Africa / Q000453:epidemiology