Latent class analysis of the diagnostic characteristics of PCR and conventional bacteriological culture in diagnosing intramammary infections caused by Staphylococcus aureus in dairy cows at dry off

Table 1 The total number of cows found positive for S. aureus in two geographically divided subpopulations by PCR and bacteriological culture (BC), as a function of the Ct-value cut-off for PCR

Ct-value cut-offPCR	BC pos / PCR pos	BC pos / PCR neg	BC neg / PCR pos	BC neg / PCR neg
Jutland/Fyn (n = 80)
≤ 32	10	15	0	55
≤ 34	17	8	4	51
≤ 37	23	2	8	47
≤ 39	23	2	11	44
Zealand (n = 60)
≤ 32	8	6	1	45
≤ 34	11	3	2	44
≤ 37	12	2	3	43
≤ 39	12	2	4	42

ISSN: 1751-0147