title: Incidence of group A beta streptococcal pharyngitis in infants.
mesh_terms: D000367:Age Factors; D006801:Humans; D007223:Infant; D010612:Pharyngitis / Q000453:epidemiology* / Q000209:etiology; D010614:Pharynx / Q000382:microbiology; D013290:Streptococcal Infections / Q000453:epidemiology*; D013297:Streptococcus pyogenes / Q000302:isolation & purification