TABLE 2.

Distribution of the ail gene among various biotype/serotype combinations of Y. enterocolitica and several Y. enterocolitica-like species^a

Species	Biotype	Serotype	No. of strains tested	No. of ail-positive strains	% ail-positive strains
Y. enterocolitica	1A	Otherb	34	0	0
	1A	O:5	7	0	0
	2	O:5	10	10	100
	2	O:9	18	18	100
	3	ND	1	0	0
	4	O:3	19	19	100
	ND	ND	24	10
Y. bercovieri			11	0	0
Y. intermedia group I			20	0	0
Y. rohdei			2	0	0
Y. kristensenii/frederiksenii/intermedia group IIc			6	0	0
Total			160	57

^aND, not determined.

^bSerotypes other than O:3, O:5, or O:9.

^cAs determined by API 20E.