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Characterization of isolates of Mycobacterium avium serotypes 4 and 8 from patients with AIDS by multilocus enzyme electrophoresis.

Respiratory Diseases Branch, Centers for Disease Control, Atlanta, Georgia 30333.

ABSTRACT

Isolates of Mycobacterium avium serotypes 4 and 8 originating from patients with AIDS in New York City, Los Angeles, or San Francisco were further characterized by multilocus enzyme electrophoresis. Reference strains used to produce typing antisera were also examined. Thirty-one electrophoretic types (ETs) were found among 58 isolates of serotype 4, while 10 ETs were identified among 21 isolates of serotype 8. One major ET was found within each serotype, and these two ETs were closely related, separated by a genetic distance of only 0.05. Six ETs were found in more than one city. In four cases, isolates of serotypes 4 and 8 shared the same ET. Multilocus enzyme electrophoresis in combination with serotyping should be helpful in locating the specific infection sources of these commonly isolated opportunistic pathogens.

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