TABLE 1.
Colony counts after exposure of laboratory strain H37RV of M. tuberculosis to various concentrations of NO for periods of 3, 6, 12, and 24 h
| NO (concn) | Colony count (mean ± SE) at the following exposure times (h)a:
|
|||
|---|---|---|---|---|
| 3 | 6 | 12 | 24 | |
| 0 | 107 ± 5 (6) | 100 ± 5 (6) | 97 ± 9 (6) | 105 ± 5 (18) |
| 25 | 109 ± 6 (12) | 109 ± 4 (12) | 102 ± 3 (12) | 66 ± 4 (18) |
| 50 | 97 ± 5 (12) | 96 ± 2 (12) | 69 ± 3 (12) | 41 ± 5 (18) |
| 70 | 80 ± 10 (7) | 63 ± 12 (7) | 58 ± 12 (11) | 21 ± 6 (11) |
| 90 | 101 ± 15 (11) | 67 ± 7 (11) | 64 ± 7 (14) | 15 ± 3 (15) |
a
Colony counts are expressed as a percentage of the count for the control. Values in parentheses refer to the number of plates prepared for each NO concentration at each time interval.