TABLE 3.

Percent concordance of C. difficile typing methods

Typing method	% Concordance for strains of the indicated type isolated in the following yr:
	1990			1992			1990 and 1992
	4-01-Ia	Other	Total	4-01-I	Other	Total	4-01-I	Other	Total
PP and REA	74	33	63	91	60	86	88	51	81
PP and AP-PCR	81	17	63	89	36	81	88	30	77
REA and AP-PCR	96	75	86	98	52	90	97	56	89
PP, REA, AP-PCR	71	18	56	88	24	79	85	22	74

^aStrains were identified as type 4 by REA, type 01 by AP-PCR, and type I by PP.