The Assessment of Viability of M. Tuberculosis after Exposure to CPC Using Different Methods

Table 1

Viable counts and proportion of metabolically active cells in control and CPC exposed cells of M. tuberculosis.

	0 day		Day 7
Strains	Control		Control		L-CPC		P-CPC
	VC	FDA*	VC	FDA*	VC	FDA*	VC	FDA*
Standard strain (H37RV)	6.27	90%	6.00	25%	6.17	22%	6.25	22%
Clinical isolate 1	6.25	80%	6.14	17%	5.90	25%	6.14	17%
Clinical isolate 2	5.84	80%	5.69	14%	5.84	7.5%	6.77	11%
Clinical isolate 3	6.20	70%	5.77	30%	5.90	20%	5.90	40%
Clinical isolate 4	6.07	60%	5.84	16%	5.84	20%	6.04	17%
Mean value (log10)	6.15		5.92		5.95		6.05

FDA* expressed as percentage of green live cells present in the culture suspension.