. 2021 Jul 16;83(9):1345–1355. doi: 10.1292/jvms.21-0085

Table 1. Sample information for the Salmonella isolates obtained from upper ^a and lower ^b levels in layer breeding chains and egg shell grading and packing centers (EGPs).

Facility type	No. of facilities	No. of isolates	No. of samples
Facility type	No. of facilities	No. of isolates	Pooled eggshell	Swab	Dust	Feces	Unidentified
Layer breeder farm	1	4				4
Hatchery	2	2		1		1
Pullet-rearing farm	5	20		14	5		1
Layer farm	39	194	89	58	45		2
EGP	2	4		4

Total	49	224	89	77	50	5	3

^a Upper levels consist of layer breeder farms, hatcheries, and pullet-rearing farms. ^b Lower levels consist of layer farms.

Table 1. Sample information for the Salmonella isolates obtained from upper a and lower b levels in layer breeding chains and egg shell grading and packing centers (EGPs).