Characterization of atypical Listeria innocua isolated from swine slaughterhouses and meat markets

Author(s)

Moreno, Luisa Zanolli ^{[1, 2]} ; Paixao, Renata ^[1] ; Gobbi, Debora Dirani ^[1] ; Raimundo, Daniele Cristine ^[1] ; Ferreira, Thais Porfida ^[1] ; Hofer, Ernesto ^[3] ; Matte, Maria Helena ^[2] ; Moreno, Andrea Micke ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Med Vet & Zootecnia, Lab Sanidade Suina & Virol, BR-05508270 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Fac Saude Publ, Lab Prat Saude Publ, BR-01246904 Sao Paulo - Brazil

^[3] Fundacao Inst Oswald Cruz, Lab Zoonoses Bacterianas, BR-21040360 Rio De Janeiro, RJ - Brazil

• Document type: Journal article
• Source: Research in Microbiology; v. 163, n. 4, p. 268-271, MAY 2012.
• Web of Science Citations: 18

Abstract

Atypical Listeria innocua strains presenting phenotypic characteristics similar to those of Listeria monocyto genes were recently isolated from food and the environment. These isolates also tested positive for virulence genes specific to L. monocytogenes. Here we report the isolation of atypical hemolytic L. innocua strains from the environment of pork processing plants in Brazil. The strains were positive for L. monocytogenes virulence genes hly, inlA and inlB by PCR and presented genotypic similarities with human isolates of L. monocytogenes via the AFLP technique using HindIII single enzyme protocol. Phenotypic and genotypic similarities suggest that these atypical L. innocua may be pathogenic strains. (C) 2012 Institut Pasteur. Published by Elsevier Masson SAS. All rights reserved. (AU)

• FAPESP's process: 10/19005-4 - Identification of virulence genes and characterization of antimicrobial resistance on strains of Listeria spp. isolated from environment, food and human infection
• Grantee: Maria Helena Matte
• Support Opportunities: Regular Research Grants