Table 1. Y. enterocolitica strains.

Strain	Relevant characteristic	Source/References
WA-314	Wild-type strain carrying virulence plasmid pYV; serogroup O8; kanamycin resistance cassette in non-coding region of pYV-O8	[39, 40]
WA-C	pYV-cured derivative of WA-314	[39]
WA-314ΔYopE	WA-C harboring pYVΔyopE; KanR	[41]
WA-314ΔYopD	WA-C harboring pYVΔyopD; KanR	this work
WA-314ΔYopB	WA-C harboring pYVΔyopB; KanR	this work
E40 GFP-YscD	E40 pAD4306; serogroup O9; pYVe40 (yopOΔ2–427 yopE21 yopHΔ1–352 yopM23 yopP23 yopT135 egfp-yscD); asdΔ292–610 (auxotrophic for diaminopimelic acid)	[10]
E40ΔLcrV	E40; serogroup O9; pYVe40ΔlcrV	this work