Twenty strains each of E. Coli, Aerobacter aerogenes, Pseudomonas, and Proteus vulgaris were tested for sensitivity to neomycin, Q-19, aureomycin, chloromycetin, and Polycyxin B. Q-19 and polymyxin B were particularly effective against Pseudomonas. Neomycin and chloromycetin were most effective against Proteus. Only 5 of the 80 strains tested were not sensitive to 31.2 μg or less of neomycin.
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Waisbren et al. (1950) studied this question.