TABLE 6.

Correlation of Y. enterocolitica biotypes and results of pyrazinamidase testing

Y. enterocolitica biotype (n)	No. of strains with pyrazinamidase result			No. of strains not tested
	Positive	Negative	Intermediate
1A (50)	42	3a	4b	1
1B (9)	0	7	0	2
2 (44)	2c	39	3d	0
3 (11)	0	11	0	0
4 (26)	0	23	0	3

^aystB positive.

^bAll but one strain was ystB positive.

^cOne strain was ystA⁺ ail⁺ yadA⁺ virF⁺ (lacking ystB), and one strain was ystA⁺ ail⁺ (lacking ystB, yadA, and virF).

^dTwo strains were ystA⁺ ail⁺ yadA⁺ virF⁺ (lacking ystB), and one strain was ystA⁺ ail⁺ (lacking ystB, yadA, and virF).