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  • Title: The Eagle effect revisited: efficacy of clindamycin, erythromycin, and penicillin in the treatment of streptococcal myositis.
    Author: Stevens DL, Gibbons AE, Bergstrom R, Winn V.
    Journal: J Infect Dis; 1988 Jul; 158(1):23-8. PubMed ID: 3292661.
    Abstract:
    We investigated the relative efficacies of penicillin, clindamycin, and erythromycin in a mouse model of myositis due to Streptococcus pyogenes. Penicillin was ineffective unless given at the time of bacterial injection, and treatment delays of 2 h reduced its efficacy such that survival was no better than that of untreated control animals (P less than .05). Survival of erythromycin-treated mice was greater than that of both penicillin-treated mice and untreated controls, but only if treatment was begun within 2 h. Mice receiving clindamycin, however, had survival rates of 100%, 100%, 80%, and 70% even if treatment was delayed 0, 2, 6, and 16.5 h, respectively. Thus, clindamycin demonstrated superior efficacy to penicillin among all the various treatment groups (P less than .05). Our results corroborate the failure of penicillin in this model of streptococcal infection and suggest that, unlike penicillin, the efficacy of clindamycin is not adversely altered by the "Eagle effect."
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