Cultures of the Mycobacterium avium-intracellulare-scrofulaceum (MAIS) complex, isolated from patients who lived throughout the state of Georgia, were studied using the serotyping scheme of Schaefer. One hundred four (77 per cent) of the 135 isolates tested could be classified into 16 serotypes. The rest were not typable. Fifty-eight per cent of all the typable strains were serotypes 1, 14, 16, and 42. Results of the serotyping were recorded, mapped, and analyzed by county of residence. Most frequent isolations of these mycobacteria were from patients who resided in the coastal plain of Georgia. This finding correlates with the mycobacterial skin test studies of Edwards and associates, who found that the largest percentage of reactors to PPD-Battey resided in the costal plain. The disparate distributions of certain serotypes suggest the possible importance of regional factors that may affect the serotypes of mycobacteria indigenous to an area. The data do not suggest that chicken or swine reservoirs are highly significant sources of human mycobacteria.
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