Table 1.

Experimental plan (day 26) for inoculation of broiler chickens with H9N2 AIV and/or E. coli

Groups	H9N2	E. coli
1	+	+(at the same time with H9N2 challenge)
2	+	+(3 days post H9N2 challenge)
3	+	+(3 days prior H9N2 challenge)
4	+	-
5	-	+(at the same time with group 1)
6 (negative control)	-	-