Table 1.

Estimation of IC₅₀s for three selection drugs tested on S. salmonicida cells^a

Selection drug	IC50 (μg/ml)	Suggested concn for use in selection (μg/ml)	% growth inhibition at selection concn
Puromycin	18	50	96
Blasticidin S	7	15	92
G418	49	150	94
Hygromycin B	120	300	88
Paromomycin	180	350	84

^aThe cells were treated with the indicated drugs and counted manually at given time points. This table shows the results from the fifth day of drug treatment. The data were used for plotting the percent growth inhibition against the concentrations tested, from which the IC₅₀s were estimated.