TABLE 3.

Development of resistant chlamydia during treatment with rifampin^a

Expt no.	Day of harvest postinfection	MIC (μg/ml)
Original chlamydia		0.0075
1	14	4
1	16	64
1	20	256
2	14	4
2	20	4

^aEmergence of resistance was observed in 3 of 50 wells (6%) for experiment 1 and 2 of 18 wells (11%) for experiment 2.