Rate of occurrence of the hemolytic streptococcus is known to vary greatly between families. The family physician is well aware of such differences and is accustomed to expect streptococcal infections more frequently in some homes than in others. It is of practical and theoretical interest to know whether it is because of some specific source of infection, as, for instance, a "carrier," that some families acquire the organisms more than others, or whether it is because of some characteristics in the individual members which make their respiratory mucosae better culture media. If it is the same streptococcus that is found in all members of a household, either in simultaneous cultures or on successive swabbings, we might assume some one source of infection, and appropriate measures could be taken to eliminate the hazard. If on the other hand different kinds of streptococci are found, either at one time or during successive
DUNLAP MB, HARVEY HS. Multiple Types of Streptococci in the Home. Am J Dis Child. 1964;107(1):47–53. doi:https://doi.org/10.1001/archpedi.1964.02080060049007
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