Genetic diversity of Listeria monocytogenes serotype 1/2a strains collected in Brazil by Multi-Virulence-Locus Sequence Typing.

Autor: da Silva DAF; Laboratory of Microbiology of Food and Sanitizes, INCQS/Fiocruz, Rio de Janeiro, Brazil., Vallim DC; Laboratory of Bacterial Zoonoses - Listeria Sector, IOC/Fiocruz, Rio de Janeiro, Brazil., Rosas CDO; Laboratory of Microbiology of Food and Sanitizes, INCQS/Fiocruz, Rio de Janeiro, Brazil., de Mello VM; Laboratory of Microbiology of Food and Sanitizes, INCQS/Fiocruz, Rio de Janeiro, Brazil., Brandão MLL; Laboratory of Microbiology Control, Bio-Manguinhos/Fiocruz, Rio de Janeiro, Brazil., de Filippis I; Laboratory of Reference Microorganisms, INCQS/Fiocruz, Rio de Janeiro, Brazil.
Jazyk: angličtina
Zdroj: Letters in applied microbiology [Lett Appl Microbiol] 2021 Mar; Vol. 72 (3), pp. 316-324. Date of Electronic Publication: 2020 Nov 22.
DOI: 10.1111/lam.13413
Abstrakt: Listeria monocytogenes is an opportunistic pathogen with the ability to adapt to different environmental conditions, resulting in safety issues for food producers. Foods contaminated by L. monocytogenes can represent a risk if consumed by susceptible individuals such as elderly, pregnant women and the immunocompromised. The aim of this study was to evaluate the genetic diversity of a collection of L. monocytogenes isolated from different matrices in Brazil during the period of 1979-2015. A total of 51 L. monocytogenes serotype 1/2a strains isolated from clinical samples (n = 3) and food samples (n = 48) were characterized by Multi-Virulence-Locus Sequence Typing (MVLST). The strains were assigned to nine virulence types (VT): VT-11 (n = 3, 5·9%), VT-45 (n = 27, 52·9%), VT-59 (n = 11, 21·6%), VT-68 (n = 3, 5·9%), VT-94 (n = 2, 3·9%), VT-107 (n = 2, 3·9%), VT-184 (n = 1, 1·9%), VT-185 (n = 1, 1·9%) and VT-186 (n = 1, 1·9%); and four of them (VT-11, VT-45, VT-59 and VT-68) have already been associated with cases of listeriosis worldwide. The VT-11, VT-59 (Epidemic Clone V) and VT-186 were identified in blood culture samples, as well as in different classes of foods. It is recommended that the epidemiological surveillance agencies evaluate the risk that foods contaminated with L. monocytogenes VTs pose to susceptible populations.
(© 2020 The Society for Applied Microbiology.)
Databáze: MEDLINE
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