Table 5 Least-squares means ± standard errors of organs, tolerant groups, inoculation dates and sex on the incidence of PCR positive organs and mink with seven PCR negative organs compared with those with at least one PCR positive organ

Organs

501.5 (< 0.001) ^¥

–

 Spleen

936

0.656 ± 0.037 ^a

–

–

 Lymph node

936

0.743 ± 0.027 ^b

–

–

 Bone marrow

936

0.331 ± 0.032 ^c

–

–

 Liver

936

0.342 ± 0.033 ^c

–

–

 Kidneys

936

0.322 ± 0.032 ^c

–

–

 Lungs

936

0.309 ± 0.031 ^c

–

–

 Intestine

936

0.194 ± 0.024 ^d

–

–

Tolerant group

68.2 (< 0.001) ^¥

25.6 (< 0.001) ^¥

 TG0

2919

0.593 ± 0.025 ^a

419

0.089 ± 0.015^a

 TG50^£

315

0.410 ± 0.056 ^b

43^£

0.129 ± 0.053 ^b

 TG75

70

0.301 ± 0.091 ^b

-^†

–

 TG100

3248

0.340 ± 0.018 ^b

474

0.184 ± 0.028 ^b

Inoculation date

44.6 (< 0.001) ^¥

19.9 (0.001) ^¥

 10/2010

1771

0.362 ± 0.038 ^ab

253

0.195 ± 0.041^ab

 12/2010

427

0.455 ± 0.056 ^b

61

0.128 ± 0.039^ab

 09/2011

1771

0.273 ± 0.030 ^ac

253

0.227 ± 0.035^a

 12/2011

210

0.497 ± 0.077 ^bc

30

0.067 ± 0.033^ab

 09/2012

1778

0.358 ± 0.033 ^ab

254

0.154 ± 0.032^ab

 09/2013

595

0.520 ± 0.045 ^c

85

0.045 ± 0.032^b

Sex

0.11 (0.74) ^¥

11.8 (0.001) ^¥

 Female

3122

0.403 ± 0.035

446

0.158 ± 0.031^a

 Male

3430

0.412 ± 0.034

490

0.089 ± 0.020^b