Tentative estimate of the prevalence of beta haemolytic streptococci among rural school children population. Qualyub (January--May, 1967).
D002648:Child; D004534:Egypt; D005260:Female; D006461:Hemolysis; D006801:Humans; D008297:Male; D013290:Streptococcal Infections / Q000453:epidemiology*