Decreased detection of ESBL- or pAmpC-producing Escherichia coli in broiler breeders imported into Sweden

Table 1 Number of shipments positive for ESBL- or pAmpC-producing E. coli in total each year per gene groups detected in each shipment

Year	No. of shipments	No. of positive shipments	No. of positive shipments per bla-gene group
Year	No. of shipments	No. of positive shipments	CIT	CTX-M-1	SHV	CTX-M-1 + CIT	CIT + SHV	CTX-M-1 + SHV	ND^a
2010	5	3	3
2011	8	8	8
2012	9	5	3						2
2013	10	4	1	2			1
2014	12	5	3	1				1
2015	16	13	9	3		1
2016	16	4	2	1	1
2017	15	1	1
2018	16	0
2019	15	0

^aNot determined: The isolates from these shipments where lost and not available for confirmation. The occurrence of pAmpC-producing E. coli carrying genes belonging to the bla_CMY-group in the birds from these shipments has been confirmed in subsequent sampling with boot swabs in these flocks (data not shown)

ISSN: 1751-0147