title: Genotypic characterization of Listeria monocytogenes isolated from humans in India.
abstract: Listeria monocytogenes is a foodborne pathogen associated with severe diseases in humans and animals. The genotypic analysis of 17 L. monocytogenes isolates recovered from humans in India during 2006-2009 using multiplex serotyping PCR allowing serovar predictions, conventional serology and by pulsed field gel electrophoresis (PFGE) is presented. The isolates were recovered from patients exhibiting various clinical conditions. A multiplex-PCR based serotyping assay revealed 88·24% (15/17) of the strains belonging to the serovar group 4b, 4d, 4e and 11·76% (2/17) to the serovar group 1/2b, 3b. Conventional serology indicated that 13 (76·47%) L. monocytogenes isolates to be of serotype 4b, 2 (11·76%) serotype 4d, and 2 (11·76%) serotype 1/2b. Ten ApaI and nine AscI pulsotypes were recognized among the 17 human isolates. PFGE analysis allowed discrimination among isolates of the same serotype and among isolates from the same sampling areas or those isolated from different areas. Thus, PFGE together with multiplex-PCR serotyping allows rapid discrimination of L. monocytogenes strains. In addition, the predominance of L. monocytogenes serotype 4b is of concern, as this serotype has been most frequently associated with human listeriosis outbreaks.
authors.affiliation: ICAR Research Complex for Goa, Ela, Old Goa, India.
authors.forename: S
authors.initials: S
authors.lastname: Kalekar
authors.forename: J
authors.initials: J
authors.lastname: Rodrigues
authors.forename: D
authors.initials: D
authors.lastname: D'Costa
authors.forename: S
authors.initials: S
authors.lastname: Doijad
authors.forename: J
authors.initials: J
authors.lastname: Ashok Kumar
authors.forename: S V S
authors.initials: SV
authors.lastname: Malik
authors.forename: D R
authors.initials: DR
authors.lastname: Kalorey
authors.forename: D B
authors.initials: DB
authors.lastname: Rawool
authors.forename: T
authors.initials: T
authors.lastname: Hain
authors.forename: T
authors.initials: T
authors.lastname: Chakraborty
authors.forename: S B
authors.initials: SB
authors.lastname: Barbuddhe
mesh_terms: D004269:DNA, Bacterial / Q000302:isolation & purification; D004196:Disease Outbreaks; D016521:Electrophoresis, Gel, Pulsed-Field; D004783:Environmental Microbiology; D005260:Female; D005506:Food Contamination; D005516:Food Microbiology; D005838:Genotype; D006801:Humans; D007194:India / Q000453:epidemiology; D008089:Listeria monocytogenes / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D008088:Listeriosis / Q000453:epidemiology* / Q000382:microbiology; D008297:Male; D016133:Polymerase Chain Reaction; D015203:Reproducibility of Results; D012703:Serotyping
chemical_list: D004269:DNA, Bacterial