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Volume 13, Number 12—December 2007

Research

Pig Herds Free from Human Pathogenic Yersinia enterocolitica1

Truls Nesbakken*Comments to Author , Terje Iversen†, and Bjørn Lium
Author affiliations: *Norwegian School of Veterinary Science, Oslo, Norway; †Nortura, Oslo, Norway; and ‡Animalia, Oslo, Norway;

Main Article

Table

Antibodies against Yersinia enterocolitica O:3 in blood samples and culture of feces from pigs in a closed system of 16 SPF herds in Norway*

Herd no. (year established) Serologic testing (1996–2007), no. pos/no. tested Culture (2005–2006), no. pos./no. tested
1 (1996) 10/397† 0/20
2 (1999) 0/150 0/20
3 (1997) 1/61 0/21
4 (1997) 0/19 0/20
5 (1998) 0/30 NA‡
6 (1999) 0/34 0/20
7 (1999) 0/20 0/20
8 (2000) 0/60 0/20
9 (2001) 0/30 NA‡
10 (2002) 1/61 0/20
11 (2002) 0/20 0/20
12 (2003) 0/30 0/22
13 (2003) 0/51 0/18
14 (2004) 15/30 11/24§
15 (2004) 0/50 0/23
16 (2004) 0/30 0/20

*SPF, specific pathogen–free. Herds 1 and 2 are nucleus herds. Herds 3–16 were established with gilts from 1 or both of the nucleus herds. A basic cut-off of optical density of 20% was used to maximize the specificity of the ELISA.
†During the first 5 years, 10 of 174 blood samples from pigs in herd 1 had a low level of antibodies against Y. enterocolitica O:3 (OD >20 but <31). None of the 223 blood samples taken from pigs in this herd from 2002 through 2007 was positive. The low-positive reactions from pigs in herd 1 might have been the result of nonspecific reactions because a few of these samples were from old sows, which might have more serologic interference.
‡NA, not applicable; no culture of feces.
§Positive for Y. enterocolitica O:3/biovar 4.

Main Article

1Findings from this investigation were presented in part at the International Pig Veterinary Science Congress, July 16–19, 2006, Copenhagen, Denmark; and 9th International Symposium on Yersinia, July 10–14, 2006, Lexington, Kentucky, USA.

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