Abstract
Prospective studies of streptococcal pyoderma were carried out among black children enrolled in Project Headstart centers in Holmes County, Miss. Sera collected from 28 of these children in early October were tested for opsonic antibodies to one of two prevalent skin strains of group A streptococci isolated from them on one or more occasions over the preceding 3 months. The two streptococcal strains (A and B) belong to M-types previously unrecognized. Ten subjects (36%) had antibody to their homologous serotypes detectable by the indirect bactericidal test: this included 6 of 10 subjects infected with strain B but only 4 of 18 infected with strain A (P < 0.05). Of 17 children who had strains A or B isolated from skin lesions only, 12% developed type-specific antibodies (TSA) against the infecting serotype. In contrast, 11 subjects had these strains isolated from throat cultures (either with or without associated pyoderma), and 72% had detectable TSA (P < 0.01). There was no demonstrable relationship between the development of antibodies to streptococcal extracellular products or to non-type-specific cellular antigens and the development of TSA. These results demonstrate that type-specific immune responses do occur following infection with pyoderma streptococci. The frequency with which such antibodies develop is variable and appears related to a number of factors, including the immunologic properties of the infecting strain and the site of bacterial colonization. Pharyngeal carriage may represent an important mechanism for development of acquired immunity to skin strains of group A streptococci.
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Selected References
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