Quantification of IgY to Erysipelothrix rhusiopathiae in serum from Swedish laying hens

BMC Veterinary Research

Table 2 Description of layer flocks with outbreaks of acute erysipelas

Farm	Flock sample ID	Housing system	Age at sampling (weeks)	Number of samples	Classification of outbreak ER isolate^a	Comment
A	A.1	Organic	77	30	Clade 3	Samples collected during an acute outbreak.
A	A.2	Organic	55	29	ns	Samples collected during an acute outbreak in flock subsequent (1 year later) to flock A.1.
B	B.1	Organic	75	31	Clade 3	Samples collected from surviving hens 6 months after an acute outbreak.
B	B.2	Organic	55	29	Clade 3	Samples collected during an acute outbreak in a flock subsequent (1 year later) to flock B.1.
C	C	Organic	72	31	ns	Samples collected during an acute outbreak.
D	D	Free-range	90	30	Clade 2	Samples collected during an acute outbreak.
E	E	Organic	50	30	ns	Samples collected during an acute outbreak.
F	F.1	Organic	66	27	ns	Samples collected during an acute outbreak.
F	F.2	Organic	67	30	nt	Samples collected 1 week after F.1 in the same flock.
G	G	Free-range	78	30	Intermediate	Samples collected during an acute outbreak.

ns not sequenced
nt not tested
^aSome of the ER isolates collected from outbreaks were whole genome sequenced within another project and assigned to clades according to whole-genome SNP comparison with isolates from the study by Forde et al. [21]. These data were however not available to us at the time of ER antibody analysis

ISSN: 1746-6148