Geographic distribution, frequency, and specimen source of Mycobacterium avium complex serotypes isolated from patients with acquired immunodeficiency syndrome

Isolates of Mycobacterium avium complex from 727 patients with acquired immunodeficiency syndrome (AIDS) were submitted by medical centers across the United States to the Centers for Disease Control for serotyping. We were able to type 630 (87%) of these isolates by our seroagglutination procedure. Almost all typeable isolates were M. avium (serotypes 1 to 6 and 8 to 11). Blood was the major specimen source for both M. avium and the nontypeable isolates. M. intracellulare serotypes made up only 3% of all isolates from AIDS patients, with sputum being the major specimen source. More than 50% of the isolates originated from either New York or California, with serotype 4 being isolated most frequently in New York and serotype 8 appearing most frequently in California. AIDS patients in Los Angeles had a significantly higher isolation frequency for serotype 8 and a significantly lower one for serotype 4 in comparison with patients in either San Francisco or New York City.

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