Int J Infect Dis. 1999 Summer;3(4):192-6. Unique Identifier : AIDSLINE
OBJECTIVE: Disseminated Mycobacterium avium infection is an emerging
opportunistic disease among patients with acquired immunodeficiency
syndrome (AIDS) in Brazil. The mode of transmission of M. avium in a
developing country setting needs to be better characterized. METHODS:
Mycobacterium avium strain collections in Sao Paulo and Rio de Janeiro
were analyzed according to the strains' IS1245 DNA gel electrophoretic
migration patterns. Medical records of the patients from whom M. avium
isolates were available were reviewed, and their demographic
characteristics were stratified according to the isolates' IS1245 DNA
fingerprint patterns. RESULTS: Of 105 patients, 33 (31%) with M. avium
isolated between 1990 and 1994 had strains having IS1245 patterns
identical in patterns seen in isolates from two or more patients
(designated as cluster pattern strains). Cluster pattern strains were
isolated from 21 (39%) of 54 patients with disseminated infection
(defined as infection due to M. avium isolated from a sterile site in an
adult patient). Six of the cluster pattern strains were isolated only
from sterile sites. In Sao Paulo, cluster pattern strains were
significantly more likely to be isolated from patients with disseminated
disease. CONCLUSIONS: These preliminary observations suggest that in
large cities of Brazil, a high proportion (at least 39%) of disseminated
M. avium infections in patients with AIDS results from a recent
transmission. Some strains of M. avium may be more likely to cause
disseminated disease than others after an infection.
JOURNAL ARTICLE Adolescence Adult AIDS-Related Opportunistic
Infections/*MICROBIOLOGY/TRANSMISSION Bacterial Typing Techniques
Blood/MICROBIOLOGY Brazil/EPIDEMIOLOGY Child Child, Preschool DNA
Fingerprinting *DNA Transposable Elements Female Genotype Human
Male Middle Age Mycobacterium avium
Complex/CLASSIFICATION/*GENETICS/ISOLATION & PURIF Mycobacterium
avium-intracellulare Infection/*MICROBIOLOGY/ TRANSMISSION
Retrospective Studies Sputum/MICROBIOLOGY Support, Non-U.S. Gov't
Support, U.S. Gov't, P.H.S.