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Narrow-spectrum P-Lactamase-Sensitive Penicillins
Penicillin G and its oral congeners (eg, penicillin V) are active against both aerobic and anaerobic gram-positive bacteria and, with a few exceptions (Haemophilus and Neisseriaspp and strains of Bacteroides other than B fragilis), are inactive against gram-negative organisms at usual concentrations .
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