Juana Liz Vidal Arboleda
University of Antioquia, Colombia
Title: Prevalence of mastitis causing bacteria isolated in two diagnostic laboratories in Antioquia (Colombia), between the years 2013 and 2015
Biography
Biography: Juana Liz Vidal Arboleda
Abstract
Bovine mastitis continues to be the most economically important disease in dairy cattle worldwide and is caused by a
broad spectrum of infectious agents. In the last decade, the main bacteria isolated from mastitic cows in Colombia have
been Streptococcus agalactiae and Staphylococcus aureus. The state of Antioquia is one of the regions in Colombia with major
milk production. Almost 10% of the milking cows present subclinical mastitis diagnoses by somatic cell count or at list with
CMT. Therefore, the microbiological culture is an indispensable preventive and control tool, because it helps producers to
take appropriate decisions. This poster used reports from cultures of submitted milk samples to two veterinary diagnostic
laboratories located in Antioquia. Between the years 2013 and 2015, 7780 milk samples were processed for microbiological
culture at the ICMT-Colanta Laboratory and at Laboratory of Microbiology, School of Veterinary Medicine, University of
Antioquia, using a standard protocol. The most commonly isolated bacteria from all samples were coagulase-negative
Staphylococcus (20.7%), followed by S. aureus (17.9%), S. agalactiae (14.3%), S. uberis (9.1%), others Streptococcus (6.7%), S.
dysgalactiae (5.9%) and others bacteria (3.0%). Gram-negative bacilli were found in 10.0% of the samples; whereas no growth
occurred in 12.0% of cultures. In conclusion, the main bacterial genus isolated was Staphylococcus with a percentage of 38.6%.
The pattern of isolation of mastitis causing bacteria in Colombia has changed over last three years with an increase in the
percentage of isolates of CNS and a decrease in isolates of S. agalactiae.