Table 1. Summary of the prevalence of presence (+) and absence (-) of relevant genes in clusters of sows and piglets clustered by antibiotic use.

Gene	Sows		Piglets
	Antepartum	Postpartum	Suckling	Weaned
bla CTX-M	-	+ Cluster 2	+	- Cluster 2; 3
mcr1	-	-	- Cluster 2	-
C. difficile	+ Cluster 2	+	+	+ Cluster 2
C. perfringens	equal +/-	+	-	+
Escherichia			+
fae				+ Cluster 4
fas	+ Cluster 1	+Cluster 2
fedA	equal +/-	-	-	+ Cluster 1

+/- = prevalence of presence/absence in all clusters/farms.