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Carriers of various pathogenic bacteria have long been recognized as a potential source of danger in causing outbreaks of disease. In spite of many attempts, as yet no entirely satisfactory means of eliminating pathogenic organisms from the upper respiratory tract has been found. Preliminary observations (1) suggested that tyrothricin (2) might be of value in treating convalescent scarlet fever patients carrying beta hemolytic streptococci. The number of individuals studied, however, was too small to provide conclusive evidence of the effectiveness of this antibiotic. Further studies were therefore undertaken in an institution1 where previous experience had shown that a high streptococcus carrier rate usually prevailed during the winter months and where frequent outbreaks of streptococcal pharyngitis had occurred. As anticipated, the incidence of Group A streptococcus carriers in the institution proved to be high. In contrast to the experience of previous years, however, no disease attributable to these organisms was observed. The results of the daily topical application of tyrothricin and a discussion of the epidemiological findings are presented in this paper.

the journal of clinical investigation/the journal of clinical investigation

ABSENCE OF CLINICAL DISEASE IN SPITE OF A HIGH INCIDENCE OF CARRIERS OF GROUP A HEMOLYTIC STREPTOCOCCI OF A SINGLE TYPE; FAILURE OF TYROTHRICIN TO INFLUENCE THE CARRIER RATE