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Background  A nationwide survey on the microbial etiology of cases of subclinical mastitis in dairy cows was carried out on dairy farms in Sweden. The aim was to investigate the microbial panorama and the occurrence of antimicrobial resistance. Moreover, differences between newly infected cows and chronically infected cows were investigated.    Methods  In total, 583 quarter milk samples were collected from 583 dairy cows at 226 dairy farms from February 2008 to February 2009. The quarter milk samples were bacteriological investigated and scored using the California Mastitis Test. Staphylococci were tested for betalactamase production and presence of resistance was evaluated in all specific udder pathogens. Differences between newly infected cows and chronically infected cows were statistically investigated using logistic regression analysis.    Results  The most common isolates of 590 bacteriological diagnoses were  Staphylococcus (S) aureus  (19%) and coagulase-negative staphylococci (CNS; 16%) followed by  Streptococcus (Str) dysgalactiae  (9%),  Str. uberis  (8%),  Escherichia (E.) coli  (2.9%), and  Streptococcus  spp. (1.9%). Samples with no growth or contamination constituted 22% and 18% of the diagnoses, respectively. The distribution of the most commonly isolated bacteria considering only bacteriological positive samples were:  S. aureus  - 31%, CNS - 27%,  Str. dysgalactiae  - 15%,  Str. uberis  - 14%,  E. coli  - 4.8%, and  Streptococcus  spp. - 3.1%. There was an increased risk of finding  S. aureus, Str. uberis  or  Str. dysgalactiae  in milk samples from chronically infected cows compared to findings in milk samples from newly infected cows. Four percent of the  S. aureus  isolates and 35% of the CNS isolates were resistant to penicillin G. Overall, resistance to other antimicrobials than penicillin G was uncommon.    Conclusions   Staphylococcus aureus  and CNS were the most frequently isolated pathogens and resistance to antimicrobials was rare.

Etiology and antimicrobial susceptibility of udder pathogens from cases of subclinical mastitis in dairy cows in Sweden