Apparent Prevalence of Beef Carcasses Contaminated with Mycobacterium avium subsp. paratuberculosis Sampled from Danish Slaughter Cattle

Table 2

Summary of threshold cycle value of IS900 PCR to detect Mycobacterium avium subsp. paratuberculosis DNA in beef carcasses by age, herd type, breed group, and fat code of the cattle.

Variable	Level	PCR threshold cycle value
		𝑁	Mean	SD	𝑄1	Median	𝑄3
Overall		54	36.73	1.78	35.67	36.80	37.87
Age	<2 years	15	36.71	2.13	35.94	37.02	37.91
	≥2 years	39	36.73	1.65	35.75	36.56	37.86
Herd type	Dairy	36	36.36	1.80	35.47	36.23	37.54
	Veal	5	36.74	0.81	36.53	36.62	37.38
	Beef	13	37.74	1.64	37.20	37.88	38.93
Breed group	Dairy	42	36.48	1.78	35.57	36.30	37.66
	Beef	8	37.91	1.15	37.18	38.04	38.44
	Cross	4	36.90	2.13	36.27	37.20	37.83
Fat code	1	10	37.25	1.53	36.68	37.34	37.79
	2	19	36.06	2.03	35.02	36.28	37.00
	≥3	25	37.02	1.55	35.93	37.20	37.89