The Role of Lancefield Groups of Beta-Hemolytic Streptococci in Respiratory Infections

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Abstract
IT IS widely recognized that Lancefield Group A streptococci are the causal agents in the majority of streptococcal infections in man. In suppurative or generalized infections the role of other groups of streptococci has been established by the isolation of these organisms in pure culture from collections of pus or from the blood stream. In respiratory infections the problem is more difficult, since various Lancefield groups of beta-hemolytic streptococci are found in the oropharynx of normal subjects. Thus, the isolation of one of these groups from the throat of a patient with respiratory disease does not necessarily establish an etiologic . . .