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Revista de Medicina Veterinaria
Print version ISSN 0122-9354
Abstract
RAMIREZ VASQUEZ, Nicolás; FERNANDEZ-SILVA, Jorge A. and PALACIO, Luis Guillermo. Incidence rate of clinical mastitis and antibiotic susceptibility of mastitis-producing pathogens in dairy cattle from Northern Antioquia, Colombia. Rev. Med. Vet. [online]. 2018, n.36, pp.75-87. ISSN 0122-9354. https://doi.org/10.19052/mv.5173.
Introduction:
Mastitis is defined as the inflammation of the mammary gland causing great economic losses in dairy herds, which merits investigation.
Objective:
To determine the incidence rate of clinical mastitis IRCM, associated etiology, and antibiotic sensitivity of pathogens isolated from cases of mastitis in dairy cattle.
Materials and methods:
37 herds were followed during 12 months for clinical mastitis (CM) diagnosis. Milk samples from CM cases were bacteriologically cultured, which underwent, along with isolates from subclinical mastitis cases from a previous study, antibiotic susceptibility testing. For data analysis, standard descriptive statistics were used.
Results:
The IRCM was 13.8 cases per 100 cows-year at risk. A total of 188 pathogens of CM cases were isolated, among which Streptococcus agalactiae, Streptococcus pyogenes, and Corynebacterium spp. were the most frequent, with 29.8%, 11.7%, and 5.9%, respectively. A high susceptibility of contagious bacteria was found for cloxacillin and cefoperazone.
Conclusions:
The present study found an IRCM of 13.8 cases per 100 cows-year at risk. The most prevalent pathogens identified in cases of CM were contagious. A high sensitivity of contagious bacteria was found for most β-lactam antibiotics.
Keywords : cattle; milk; mastitis; antibiotic susceptibility test; antimicrobial resistance; incidence rate of clinical mastitis..