Table 2.

Change of MNV detection from feces after the first isolation.

Mice	Week after detection of MNV					ELISA
	0	1	2	3	4
A	+*	+	-	-	-	+
B	+	-	-	+	-	+
C	+	-	-	-	-	+
D	+	+	+	+	+	+
E	+	+	+	+	+	+

^*RT-PCR positive.