In vitro antibiotic susceptibility of Legionellaceae: search for alternative antimicrobial drugs.

Reference strains of Legionella pneumophila (serotypes 1-4, and 6), Legionella micdadei , and Legionella bozemanii proved susceptible (agar dilution test, buffered charcoal yeast extract agar) to erythromycin, rifampin, augmentin (amoxycillin plus clavulanic acid), cefotaxime, cefoxitin, enoxacin , fusidic acid, and norfloxacin; cefamandole was less active. The strains varied in susceptibility to fosfomycin.