M ycobacterium avium complex genomics and transmission in a London hospital.
Eur Respir J
; 61(4)2023 04.
Article
in En
| MEDLINE
| ID: mdl-36517182
ABSTRACT
BACKGROUND:
Non-tuberculous mycobacteria (NTM) are environmental microorganisms and opportunistic pathogens in individuals with pre-existing lung conditions such as cystic fibrosis (CF) and non-CF bronchiectasis. While recent studies of Mycobacterium abscessus have identified transmission within single CF centres as well as nationally and globally, transmission of other NTM species is less well studied.METHODS:
To investigate the potential for transmission of the Mycobacterium avium complex (MAC) we sequenced 996 isolates from 354 CF and non-CF patients at the Royal Brompton Hospital (London, UK; collected 2013-2016) and analysed them in a global context. Epidemiological links were identified from patient records. Previously published genomes were used to characterise global population structures.RESULTS:
We identified putative transmission clusters in three MAC species, although few epidemiological links could be identified. For M. avium, lineages were largely limited to single countries, while for Mycobacterium chimaera, global transmission clusters previously associated with heater-cooler units (HCUs) were found. However, the immediate ancestor of the lineage causing the major HCU-associated outbreak was a lineage already circulating in patients.CONCLUSIONS:
CF and non-CF patients shared transmission chains, although the lack of epidemiological links suggested that most transmission is indirect and may involve environmental intermediates or asymptomatic carriage in the wider population.
Full text:
1
Database:
MEDLINE
Main subject:
Mycobacterium avium-intracellulare Infection
/
Cystic Fibrosis
/
Mycobacterium Infections, Nontuberculous
Limits:
Humans
Country/Region as subject:
Europa
Language:
En
Year:
2023
Type:
Article