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First case of pulmonary disease caused by a Mycobacterium avium complex strain of presumed veterinary origin in an adult human patient.

ABSTRACT: We report the first case of pulmonary disease caused by a strain of Mycobacterium avium complex of presumed veterinary origin in an elderly patient. All serial isolates were identified by multilocus sequence analysis based on rpoB, hsp65, and 16S rRNA fragments. Disease persisted despite macrolide-based combination antibiotic therapy.

SUBMITTER: Kim SY

PROVIDER: S-EPMC3716041 | biostudies-literature | 2013 Jun

REPOSITORIES: biostudies-literature

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First case of pulmonary disease caused by a Mycobacterium avium complex strain of presumed veterinary origin in an adult human patient.

Kim Su-Young SY Shin Sung Jae SJ Lee Nam Yong NY Koh Won-Jung WJ

Journal of clinical microbiology 20130403 6

We report the first case of pulmonary disease caused by a strain of Mycobacterium avium complex of presumed veterinary origin in an elderly patient. All serial isolates were identified by multilocus sequence analysis based on rpoB, hsp65, and 16S rRNA fragments. Disease persisted despite macrolide-based combination antibiotic therapy. ...[more]

PMID: 23554206

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Project description:RationaleMycobacterium avium complex, is the most common nontuberculous mycobacterial respiratory pathogen in humans. Disease mechanisms are poorly understood due to the absence of a reliable animal model for M. avium complex pulmonary disease.ObjectivesThe objectives of this study were to assess the susceptibility, immunologic and histopathologic responses of the common marmoset (Callithrix jacchus) to M. avium complex pulmonary infection.Methods7 adult female marmosets underwent endobronchial inoculation with 108 colony-forming units of M. intracellulare and were monitored for 30 or 60 days. Chest radiograph was assessed at baseline (prior to infection) and at the time of sacrifice (30 days for 3 animals and 60 days for 4 animals), and bronchoalveolar lavage cytokines, histopathology and cultures of the bronchoalveolar lavage, lungs, liver and kidney were assessed at time of sacrifice. Serum cytokines were monitored at baseline and weekly for 30 days for all animals and at 60 days for those alive. Group differences in serum cytokine measurements between those that tested positive versus negative for the M. intracellulare infection were assessed using a series of linear mixed models.Measurements and main resultsFive of seven animals (two at 30 days and three at 60 days of infection) had positive lung cultures for M. intracellulare. Extra-pulmonary cultures were positive in three animals. All animals appeared healthy throughout the study. All five animals with positive lung cultures had radiographic changes consistent with pneumonitis. At 30 days, those with M. intracellulare lung infection showed granulomatous inflammation, while at 60 days there were fewer inflammatory changes but bronchiectasis was noted. The cytokine response in the bronchoalveolar lavage fluid was uniformly greater in the animals with positive M. intracellulare cultures than those without a productive infection, with greater levels at 30-days compared to 60-days. Similarly, serum cytokines were more elevated in the animals that had positive M. intracellulare cultures compared to those without a productive infection, peaking 14-21 days after inoculation.ConclusionEndobronchial instillation of M. intracellulare resulted in pulmonary mycobacterial infection in marmosets with a differential immune response, radiographic and histopathologic abnormalities, and an indolent course consistent with M. avium complex lung infection in humans.

Dataset Information

First case of pulmonary disease caused by a Mycobacterium avium complex strain of presumed veterinary origin in an adult human patient.

Publications

First case of pulmonary disease caused by a Mycobacterium avium complex strain of presumed veterinary origin in an adult human patient.

Similar Datasets

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