TABLE 1.

Growth of five strains of M. tuberculosis in positive-control samples and filtrates^a

Strain	Species	Drug resistance(s)	No. of growth units
			Positive control	Filtrate A	Filtrate B
1	M. tuberculosis complex	Sensitive	7,037	0	0
2	M. tuberculosis	Isoniazid, rifampin	18,216	0	0
3	M. tuberculosis	Rifampin	20,413	0	0
4	M. tuberculosis	Sensitive	26,757	0	0
H37Rv	M. tuberculosis	Sensitive	22,776	0	0

^aIn duplicate (A and B).