Emergence of Enteric Viruses in Production Chickens Is a Concern for Avian Health

Table 4

Positive samples for one or more viruses obtained from broiler chickens, breeders, and layer hens and the respective age in weeks at chicks which were detected.

Broiler chickens		Broiler breeders		Pullet/layer hens
Weeks	Number of positive samples	Weeks	Number of positive samples	Weeks	Number of positive samples
1	27	1	3	4	1
2	32	8	1	8	1
3	31	12	1	13	2
4	33	23	1	23	1
5	20	31	1	24	1
6	33	32	2	31	1
7	17	33	2	48	1
		34	1	93	2
		35	1	106	1
		37	3
		40	2
		45	1
		51	1
		57	1
		58	1
Total	193 (85.4%)	Total	22 (9.7%)	Total	11 (4.9%)

% of samples positive for each type of bird (𝑛=226).