Vistamycin is a new antibiotic developed at Central Research Laboratories of Meiji Seika Kaisha, Ltd. in 1967.
In vitro and
in vivo studies on the antimicrobial action of vistamycin have been carried out, and the following results were obtained :
1) Vistamycin was broadly effective against both Gram-positive and-negative bacteria. The antibacterial spectrum of Vistamycin was the same as that of kanamycin.
2) As for the antibacterial activity against the Susceptible strains, the minimum inhibitory concentration of Vistamycin was the same or a little less in comparison with that of kanamycin.
3) It was confirmed that there may be the distinct cross-resistance between Vistamycin and kanamycin.
4) The antimicrobial activity of Vistamycin tended to increase when the pH of culture increases at alkaline side.
5) In the studies with mice experimentally infected with
Staphyolcoccus aureus, Diplococcus pneumoniae or
Escherichia coli, Vistamycin showed the curative effects which were parallel with its minimum inhibitory concentration values, its ED
50 being no more or less than that of kanamycin.
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