TABLE 1.

RT activity is expressed as counts/25 μl of spotted reaction mixture. Results represent the mean ± S.E. of six independent RT assays. Viral RNA content was calculated from four independent RNA extractions, and results represent the mean ± S.E. of eight spots (two per sample)

Virus	Endogenous RT activity	Viral RNA content
	cpm × 104/500 TCID50	cpm × 102/500 TCID50
Wild-type HIV	2,204 ± 271	387 ± 56
HIV PRI54V/V82A	1,626 ± 678	426 ± 84
Wild-type HIV + nevirapine	75 ± 26	Not determined
HIV PRI54V/V82A + nevirapine	113 ± 18	Not determined