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Table 1 Summary description of the four Danish dairy herds and diagnostic test results prior to and during the study period

From: Mycoplasma bovis antibody dynamics in naturally exposed dairy calves according to two diagnostic tests

Herd no. 1 2 3 4
Prior to enrolment
 Herd size (No. of cows) 177 174 182 391
 Estimated start of outbreak Early Jun 2015 Early Jul 2015 Late Nov 2015 Mid Dec 2015
After enrolment
 Data collection 1 Jul 2015–16 Sep 2016 20 Jul 2015–6 Oct 2015 8 Dec 2015–23 Feb 2016 20 Jan 2016–5 Apr 2016
 Age group primarily affected Cows Cows and calves Cows Cows and calves
Primary clinical signs  
 Cows Mastitis Mastitis, arthritis Arthritis Mastitis, arthritis
 Calves Pneumonia, otitis media Arthritis, otitis media, pneumonia Few cases of arthritis and otitis media Arthritis, otitis media, pneumonia
Diagnostic tests
 Number of calves 15 22 20 26
 Number of samples 51 101 89 93
 Positive samplesa
  BioXb 16 26 14 13
  MilAc 48 98 41 88
 Positive cultures from necropsied calves (total necropsied calves) 0 (0) 1 (1) 0 (2) 2 (2)
  1. aNumber of seropositive samples out of all sera obtained during the study period
  2. bODC% values > 37 in BioX Bio K 302 ELISA (BioX Diagnostics, Belgium)
  3. cAU > 135 in the MilA ELISA