Table 2. DNA fingerprinting results for culture-confirmed tuberculosis cases among homeless persons, Denver Health Tuberculosis Clinic, 1988–1998^a.

	Years
RFLP clusters	1988	1989	1990	1991	1992	1993	1994	1995	1996	1997	1998	Total
A			1					1				2
B		1		[1]b	[2]	1						2 [3]
C	1						1				1	3
D				1		1						2
E				1	1							2
F								2				2
G				1		1				[2]		2 [2]
H			1	3 [1]	2		1			[1]		7 [2]
I			2	3	1 [2]	3 [1]	1	2 [2]	[2]			12 [7]
Total clusters	1	1	4	9 [2]	4 [4]	6 [1]	3	5 [2]	0 [2]	0 [3]	1	34 [14]
Unique RFLP	1	1	3	2	3	6	3	7	5	6	5	42
Test ratioc	2/4 (50)	2/2 (100)	7/7 (100)	11/11 (100)	7/7 (100)	12/12 (100)	6/6 (100)	12/17 (71)	5/7 (71)	6/7 (86)	6/7 (86)	76/87 (87)

^aRFLP, restriction fragment length polymorphism.
^bNumbers in brackets refer to the 14 case isolates from nonhomeless patients that share DNA fingerprinting patterns with the homeless patients.
^cNumber of case isolates with DNA fingerprinting results divided by total culture-positive cases (% tested).