Disease Surveillance Strategies in Swine

Table 3 Summary of the national Salmonella control program in pig herds in Sweden, Finland and Norway during 1995–1998 (number of positive Samples/total number of samples).

	1995			1996			1997			1998
	Sweden	Finland	Norway	Sweden	Finland	Norway	Sweden	Finland	Norway	Sweden	Finland	Norway
Lymph node samples from
sows and boars	2/1361^a	9/2725	-	3^e/2009	8/2627	-	2/2614	4/3165	-	7/3074	3/3070	-
fattening pigs	1/1721^a	10/2792	4/3207^d	1/2699	5/2683	0/2818^d	6^e/3382	6/3209	0/2905^d	3/3914	5/3247	0/3104^d
Faecal herd samples^b from
nucleus and multiplying^c herds	n.a.	n.a.	1/175	0/191	0/197	0/185	1/137	2/139	0/147	0/167	0/114	0/178
sow pool herds	n.a.	-	-	0/23	-	-	0/30	-	-	0/35	-	-

^a Samples collected during weeks 19–52.
^b Sweden: 10 pooled samples per herd. Each cultivation represents 5 sows and is pooled at the laboratory; Finland: 2 pooled samples per herd. Each Cultivation represents a pooled sample from 5 pens with growing/finishing pigs; Norway: 3–20 samples per herd. Each cultivation represents 5 Growing/finishing pigs in a pen.
^c In Finland only nucleus herds included.
^d Samples from sows included.
^e Two positive samples from a same herd. n.a. Information not available.

ISSN: 1751-0147