A murine chronic model of
M. avium-intracellulare infection was established in our labolatory and reported at the 58th annual meeting. The evaluation of therapeutic effects of some regimens against the murine chronic model has been studied, and the several multidrug regimens including Kanamycin (KM) revealed to be effective.
In the previous experiments, however, the treatments were uniformly begun one week after infection. This time, the treatments were begun immediately, two weeks and four weeks after infection, and the evaluation of the effects was done by observing the macroscopic lesions of each organ, weighing the lungs, spleens, kidnies and livers, and counting the number of viable bacilli per lung and spleen. The regimens used in this experiment were KM-Rifampicin (RFP)-Ethambutol (EB) and KM-RFP-EB-Cyclocerine (CS)-Ethionamide (TH).
The two regimens, even when they were given four weeks after infection, were found effective in the macroscopic lesions, weights and viable counts of bacilli of the organs. The effect of delayed treatments was almost the same as that of the immediate therapy. The difference between these two regimens was, however, not significant.
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