title: Molecular variability among strains of Pasteurella multocida isolated from an outbreak of haemorrhagic septicaemia in India.
abstract: The applicability of conventional and molecular methods for rapid detection and differentiation of Pasteurella multocida serogroup B isolates involved in an outbreak of haemorrhagic septicaemia affecting Indian buffaloes, was studied. Five isolates were obtained and were subjected to phenotypic and genotypic characterization. None of the five isolates could be differentiated on the basis of cultural, biochemical, pathogenicity and antimicrobial sensitivity patterns. Polymerase chain reaction (PCR)-based techniques were found to be specific and sensitive for rapid detection and differentiation of isolates. Repetitive extragenic palindromic (REP-) PCR, enterobacterial repetitive intergenic consensus (ERIC-) PCR and single-primer PCR differentiated all the five isolates into different profiles. All the isolates involved in the outbreak were found to have a genetic profile different from standard P. multocida strain (P52). However, three isolates had similar profiles, whereas each of the remaining two had a different profile. The study indicates the involvement of multiple strains of P. multocida in a single outbreak of haemorrhagic septicaemia in buffaloes. The results also indicate that molecular methods of detection and typing are superior to conventional methods for rapid epidemiological investigations of haemorrhagic septicaemia.
authors.affiliation: Division of Bacteriology and Mycology, Indian Veterinary Research Institute, Izatnagar 243122, UP India.
authors.forename: A
authors.initials: A
authors.lastname: Biswas
authors.forename: S B
authors.initials: SB
authors.lastname: Shivachandra
authors.forename: M K
authors.initials: MK
authors.lastname: Saxena
authors.forename: A A
authors.initials: AA
authors.lastname: Kumar
authors.forename: V P
authors.initials: VP
authors.lastname: Singh
authors.forename: S K
authors.initials: SK
authors.lastname: Srivastava
mesh_terms: D000818:Animals; D001681:Biological Assay; D002020:Buffaloes / Q000382:microbiology*; D016172:DNA Fingerprinting / Q000662:veterinary; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004196:Disease Outbreaks; D006483:Hemorrhagic Septicemia / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D007194:India / Q000453:epidemiology; D051379:Mice; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D017817:Nasal Lavage Fluid / Q000382:microbiology; D010326:Pasteurella Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D016979:Pasteurella multocida / Q000145:classification / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000662:veterinary
chemical_list: D004269:DNA, Bacterial