title: [Primary prevention of rheumatic fever. Occurrence of beta hemolytic Streptococcus of the A group in 11,314 students in Magdalena Contreras].
abstract: A study was made in 11,314 school-age children to determine the prevalence of streptococcus pyogenes group A. The children studied belonged to a low socioeconomic group of one of the political boroughs of the Federal District. The prevalence found was 6.86%. There were no differences in the percentage of carriage according to the school surveyed or the school grade studied. However, marked differences were found when the presence of arthralgias was related to the carriage of streptococcus. Children complaining of artharlgias showed twice as much streptococcus in their pharynx than the ones not carrying it.
mesh_terms: D002648:Child; D002675:Child, Preschool; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008800:Mexico; D010614:Pharynx / Q000382:microbiology*; D012213:Rheumatic Fever / Q000453:epidemiology / Q000382:microbiology*; D012959:Socioeconomic Factors; D013297:Streptococcus pyogenes / Q000302:isolation & purification*
vernacular_title: Estudios sobre la prevención primaria de fiebre reumática. I. Prevalencia de estreptococo beta hemolítico del grupo A, en 11,314 escolares de la Magdalena Contreras