TABLE 3.

Trimethoprim MICs for the S. aureus parent strain, JE2-pabA, and JE2-tdk on various media

Strain	Trimethoprim MIC (mg/liter) for the indicated strain on the following mediuma:
	BHI		Human blood		Sheep blood		Horse blood
	−T	+T	−T	+T	−T	+T	−T	+T
Parent	1	>32	0.75	>32	>32	>32	1	>32
pabA mutant	1	>32		>32	>32	>32	>0.002	>32
tdk mutant	0.25	0.25	0.75	0.75	0.5	0.5	1	1

^a−T, no exogenous thymidine added, +T, thymidine added at 400 μg ml⁻¹.