title: Detection of Shiga toxigenic (STEC) and enteropathogenic (EPEC) Escherichia coli in dairy buffalo.
abstract: Enteropathogenic (EPEC) and Shiga toxigenic (STEC) Escherichia coli are among the bacteria most associated with enteric diseases in man. The aims of this study were to determine the prevalence of STEC and EPEC in dairy buffalo and then characterize these isolates genetically. To determine the prevalence of these bacteria, samples were collected from the feces and milk of buffaloes. In total, 256 samples were collected in 3 samplings, of which 76 samples tested positive for either the stx1, stx2 or eae genes or a combination thereof. From the positive samples, 22 STEC and 11 atypical EPEC (aEPEC) isolates were obtained. The isolates showed 23 different genetic profiles. No profile was very frequent in STEC isolates. On the other hand, the profile eae+, ehxA+, iha+, efa1+, toxB+, paa+, lpfAO113+ was found in 45% of the aEPEC isolates. In addition to stx1, stx2 and eae, the genes ehxA, efa1, saa, lpfAO113, lpfAO157/OI-141, lpfAO157/OI-154, toxB and iha were present in the isolates. Serogroup O26 was found in 26% of the aEPEC. Other serogroups detected include O87, O145, O176 and O179. The isolates were sensitive to almost all drugs tested and some isolates shared the same fingerprint patterns by enterobacterial repetitive intergenic consensus sequence-PCR (ERIC-PCR). The results suggest that, besides major reservoirs of STEC, buffaloes are also aEPEC reservoirs. The detection of a serogroup (O26), and putative virulence genes (efa1 ehxA, paa and lpfAO113), previously associated with aEPEC isolated from humans with diarrhea in aEPEC from buffaloes should be studied further.
authors.affiliation: Programa de Pós-graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, SP, Brazil. Electronic address: liviaberaldo@yahoo.com.br.
authors.forename: Lívia Gerbasi
authors.initials: LG
authors.lastname: Beraldo
authors.affiliation: Programa de Pós-graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, SP, Brazil.
authors.forename: Clarissa Araújo
authors.initials: CA
authors.lastname: Borges
authors.affiliation: Programa de Pós-graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, SP, Brazil.
authors.forename: Renato Pariz
authors.initials: RP
authors.lastname: Maluta
authors.affiliation: Programa de Pós-graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, SP, Brazil.
authors.forename: Marita Vedovelli
authors.initials: MV
authors.lastname: Cardozo
authors.affiliation: Faculdade de Zootecnia de Dracena, Universidade Estadual Paulista, SP, Brazil.
authors.forename: Everlon Cid
authors.initials: EC
authors.lastname: Rigobelo
authors.affiliation: Programa de Pós-graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, SP, Brazil.
authors.forename: Fernando Antônio
authors.initials: FA
authors.lastname: de Ávila
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002020:Buffaloes / Q000382:microbiology*; D003612:Dairying; D004197:Disease Reservoirs / Q000382:microbiology; D054308:Enteropathogenic Escherichia coli / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D005243:Feces / Q000382:microbiology; D005260:Female; D008892:Milk / Q000382:microbiology; D012703:Serotyping; D054323:Shiga-Toxigenic Escherichia coli / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D037521:Virulence Factors / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents; D037521:Virulence Factors
keywords: Buffalo; EPEC; Escherichia coli; Putative adhesins; STEC; aEPEC