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Antimicrob Agents Chemother. 1986 September; 30(3): 465-467

Antimicrobial therapy of experimental endocarditis caused by nutritionally variant viridans group streptococci.

N K Henry, W R Wilson, R B Roberts, J F Acar and J E Geraci

ABSTRACT

Rabbits with nutritionally variant viridans group streptococcal experimental endocarditis were treated three times daily for 3 days with procaine penicillin (1.2 X 10(6) U) alone or together with low-dose streptomycin (2 mg/kg), high-dose streptomycin (8 mg/kg), low-dose gentamicin (0.32 mg/kg), or high-dose gentamicin (1.05 mg/kg). The mean 0.5-h serum concentrations of streptomycin were 5.3 and 22.5 micrograms/ml in the low- and high-dose group, respectively, and the concentrations of gentamicin were 0.7 and 2.5 micrograms in the low- and high-dose groups, respectively. The combination of procaine penicillin with each dose of aminoglycoside was significantly more effective (P less than 0.001) than was procaine penicillin alone. In combination with procaine penicillin, the higher dose of streptomycin was significantly more effective (P less than 0.02) than the lower dose of streptomycin. The higher dose of streptomycin was not significantly more effective than either dose of gentamicin. The results of treatment with the high or low dose of gentamicin were virtually identical.

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Antimicrob Agents Chemother. 1986 September; 30(3): 465-467

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