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PMID: 8031351 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Mycobacterium avium strains resistant to clarithromycin and azithromycin.

Antimicrobial agents and chemotherapy ·Vol. 37 ·No. 11 ·1993-11-00 ·Pages 2364-70

Heifets L, Mor N, Vanderkolk J

Abstract

Mycobacterium avium strains susceptible to clarithromycin and azithromycin contain mutants resistant to these macrolides with a frequency of 1.1 x 10(-10) to 1.2 x 10(-6). Cross-resistance between clarithromycin and azithromycin was demonstrated with mutants selected in the laboratory as well as with resistant strains isolated from patients. The susceptibility-resistance patterns of the macrolide-resistant strains with drugs other than macrolides were the same as those of the original susceptible strains. The emergence of clarithromycin resistance in patients was a result of multiplication of the preexisting resistant mutants that survived the elimination of bacteria during the initial period of treatment and was an exclusive cause of the relapse of bacteremia.

MeSH Terms
Azithromycin/pharmacology Clarithromycin/pharmacology Drug Resistance, Microbial Humans Microbial Sensitivity Tests Mycobacterium avium Complex/drug effects,metabolism Mycobacterium avium-intracellulare Infection/drug therapy,microbiology
Chemicals
Azithromycin Clarithromycin
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Heifets L
National Jewish Center for Immunology, and Respiratory Medicine, University of Colorado Health Sciences Center, Denver.
Mor N
Vanderkolk J
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17 references, click to expand
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Article Info
Journal
Antimicrobial agents and chemotherapy
Abbr.
Antimicrob Agents Chemother
ISSN
0066-4804
Published
1993-11-00
Pages
2364-70
Language
English
Region
United States
NLM ID
0315061
PMCID
PMC192393
Subset
IM
Corrections
CommentIn
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