Table 1.

Viral isolation. Group 1: unvaccinated animals. Group 2: animals immunized once five days before challenge. Group 3: animals immunized once three days before challenge. Group 4: animals immunized once one day before challenge. Dpc: days post-challenge. (-): negative samples. (+): positive samples. (N/S): no samples.

		Blood					Spleenen	Tonsil	Ileum	Rectal Swab
Group	Animals	3 dpc	7 dips	14 dpc	21 dpc	28 dpc	At sacrifice			21 dpc	28 dpc
1	652	-	+	-	N/S	N/S	+	+	+	N/S	N/S
	605	-	-	+	N/S	N/S	+	+	+	N/S	N/S
	601	-	-	+	N/S	N/S	+	+	+	N/S	N/S
	619	-	-	+	N/S	N/S	+	+	+	N/S	N/S
	656	-	-	+	N/S	N/S	N/S	N/S	N/S	N/S	N/S
2	618	-	-	-	-	-	-	-	-	-	-
	653	-	-	-	-	-	-	-	-	-	-
	609	-	-	-	-	-	-	-	-	-	-
	655	+	-	-	-	-	-	-	-	-	-
	604	-	-	-	-	-	-	-	-	-	-
3	608	-	-	-	-	-	-	-	-	-	-
	654	+	+	N/S	N/S	N/S	+	+	-	N/S	N/S
	651	-	-	N/S	N/S	N/S	+	+	-	N/S	N/S
	657	-	-	-	-	-	-	-	-	-	-
	602	-	-	N/S	N/S	N/S	+	+	-	N/S	N/S
4	603	-	-	-	-	-	-	-	-	-	-
	606	+	+	N/S	N/S	N/S	+	+	-	N/S	N/S
	607	-	-	-	-	-	-	-	+	-	-
	610	-	+	+	N/S	N/S	+	+	-	N/S	N/S
	620	-	-	N/S	N/S	N/S	+	+	-	N/S	N/S