TABLE 3.

Serology results for breeder hens^a

Farm	No. of sera tested	No. positive
		RST	LPS ELISA	Total	gm ELISA
Layer-breeders
14	153	0	54	54	0
19	139	82	106	113	1
20	151	0	4	4	0
26	99	0	5	5	0
27	99	6	30	33	0
30	149	3	8	11	0
31	151	0	63	63	0
33	168	0	37	37	0
34	157	0	7	7	0
Broiler-breeders
2	150	10	0	10	0
3	153	5	7	11	2
4	158	6	0	6	0
25	160	15	40	46	5
32	150	100	133	143	141
Totalb	2,037	227	494	543	149

^aOne flock was tested for each farm. Values indicate positive results for each test.

^bA total of 14 flocks were tested.