Enhancement of treatment efficacy in experimental plague by the sequential administration of antibiotics

: It was shown that the use of ampicillin, azlocillin or polymyxin 24 or 96 hours after the plague infection at the background of the every-day use of rifampicin in the doses protecting only 30 per cent of the animals from death provided 80-100-percent survival of the animals. With the every-day use of ampicillin, azlocillin or polymyxin in succession with rifampicin there was observed a 3-fold increases in the survival of the albino mice as compared to those exposed to an analogous dose of rifampicin alone. A decrease in the number of administrations of the above drugs and an increase in the intervals between the administration also resulted in a significant rise of the animal survival in comparison with that after the every-day use of a similar dose of rifampicin.