02118naa a2200277 a 450000100080000000500110000800800410001902200140006002400340007410000210010824501310012926000090026050000760026952012420034565000130158765000120160065000100161265300090162265300140163165300150164570000150166070000150167570000190169070000220170977301090173110607332020-01-31       2002    bl uuuu     u00u1 u    #d  a0044-605X7 a10.1186/1751-0147-43-2212DOI1 aGIANNEECHINI, R.  aOccurrence of clinical and sub-clinical mastitis in dairy herds in the west littoral region in Uruguay.h[electronic resource]  c2002  aArticle history: Received September 5, 2001 / accepted August 12, 2002.  aABSTRACT. Twenty-nine dairy farms were selected to determine the incidence of clinical mastitis, prevalence of sub-clinical mastitis and bacterial aetiology in the West Littoral Region of Uruguay. In samples taken by the owner and frozen at -20°C during a week the incidence rate of clinical mastitis was determined as 1.2 cases per 100 cow-months at risk. Staphylococcus aureus was the most common isolated pathogen in 37.5% of 40 milk samples from clinical cases obtained in 1 month. No bacteria grew in the 32.5% of the total samples. A sub-sample including 1077 dairy cows from randomly selected farms was used to determine the prevalence of sub-clinical mastitis. These samples were taken on one visit to each farm. The prevalence was 52.4% on a cow basis and 26.7% on an udder quarter basis. In 55.1% of the quarters of the selected animals with more than 300 000 cells/ml there was no growth. The isolated pathogens from sub-clinical cases and their relative frequencies were: Staphylococcus aureus 62.8%, Streptococcus agalactiae 11.3%, Enterococcus sp, 8%, coagulase-negative staphylococci 7.4%, Streptococus uberis 6.4%, Streptococcus dysgalactiae 1.8%, Escherichia coli 1.5% and Staphylococcus hyicus coagulase-positive 0.6%.  aMASTITIS  aURUGUAY  aVACAS  aCows  aIncidence  aPrevalence1 aCONCHA, C.1 aRIVERO, C.1 aDELUCCHI, M.I.1 aMORENO LÓPEZ, J.  tActa Veterinaria Scandinavica, 2002, Volume 43, Issue 4, Article number A221, Pages 221-230. OPEN ACCESS