title: [Study of Mycobacterium bovis in milk using bacteriological methods and the polymerase chain reaction].
abstract: The frequency of Mycobacterium bovis detection in milk samples obtained from infected animals was explored in an intensive dairy area in Argentina. To this end, an "in house" polymerase chain reaction (PCR) method was developed using Mycobacterium tuberculosis Complex specific INS1-INS2 primers, and its performance was compared with that of bacteriological methods. The decontamination procedures previous to culture reduced M. bovis viability. The pathogen was identified in milk samples from 1 of 143 infected cows and in none of 43 uninfected ones. Even though PCR sensitivity was found to be 2-20 times higher than that of bacteriology in experimentally inoculated milk samples, all 186 field samples resulted negative by PCR, including the bacteriologically-confirmed one. In spite of the high prevalence of bovine tuberculosis in Argentinian dairy herds, the detection of M. bovis in milk is an unusual finding.
authors.affiliation: Facultad de Ciencias Veterinarias, Universidad Nacional de Rosario, 2170 Casilda.
authors.forename: A
authors.initials: A
authors.lastname: Pérez
authors.forename: A
authors.initials: A
authors.lastname: Reniero
authors.forename: A
authors.initials: A
authors.lastname: Forteis
authors.forename: S
authors.initials: S
authors.lastname: Meregalli
authors.forename: B
authors.initials: B
authors.lastname: López
authors.forename: V
authors.initials: V
authors.lastname: Ritacco
mesh_terms: D000818:Animals; D001118:Argentina / Q000453:epidemiology; D001431:Bacteriological Techniques; D002417:Cattle; D004269:DNA, Bacterial / Q000032:analysis; D005260:Female; D008892:Milk / Q000382:microbiology*; D009163:Mycobacterium bovis / Q000235:genetics / Q000302:isolation & purification*; D016133:Polymerase Chain Reaction; D015995:Prevalence; D012680:Sensitivity and Specificity; D014380:Tuberculosis, Bovine / Q000453:epidemiology / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial
vernacular_title: Estudio de Mycobacterium bovis en leche mediante métodos bacteriológicos y reacción en cadena de la polimerasa.