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Table 2 Results of bacteriological cultures of milk samples of a) 104 quarters (66 cows) with a California Mastitis Test ≥ 4 at the initial udder health examination of 257 cows; b) 38 cases of clinical mastitis yielding 42 sampled quarters (one harboured two pathogens); and c) 107 udder quarters in 27 cows with UDS1 ≥ 4 at drying off (one cow had a blinded quarter)

From: Mastitis and related management factors in certified organic dairy herds in Sweden

  Initial examination Clinical mastitis2 Drying off2
Culture results N % N % N %
Staphylococcus aureus (of which β-lactamase prod.) 19 (2) 18.3 (10) 5 (1) 11.9 (20) 7 (0) 6.5 (0)
Coagulase negative staphylococci (of which β-lactamase prod.) 17 (5) 16.4 (30) 0 0.0 7 (3) 6.5 (43)
Streptococcus uberis 8 7.7 3 7.0 5 4.7
Streptococcus dysgalactiae 10 9.6 4 9.3 2 1.9
Escherichia coli    8 18.6   
Arcanobacterium pyogenes    1 2.3   
Mixed growth 10 9.6 1 2.4   
Negative 40 38.5 21 50.0 86 80.0
  1. 1 Udder disease score (UDS) are graded 0–9, where each figure indicates a 10% increase of the probability that the cow has infectious mastitis.
  2. 2 Samples taken by farmers using Mastistrip®.