TABLE 3.

Proportion of Legionella species other than L. pneumophila that were inhibited by MICs less than the MIC₉₀s (μg/ml) of the five antimicrobial agents tested

Drug	MIC90a	No. of strains susceptible to a MIC < MIC90/total no. tested		P for Fisher’s exact test
		L. pneumophila	Non-L. pneumophila
HMR 3647	0.125	37/46	37/51	0.47
HMR 3004	0.062	44/46	35/51	0.0006
Erythromycin	0.50	39/46	24/51	0.0001
Clarithromycin	0.062	44/46	33/51	0.0001
Levofloxacin	0.032	35/46	28/51	0.03

^aMIC₉₀, MIC at which 90% of the strains are inhibited.