Abstract
Staphylococci and colon bacilli were isolated from lesions of various types of respiratory diseases, fowl pox, staphylococcosis, and colibacillosis in chickens over a period from September, 1963, to March, 1965. They were examined for susceptibility to sodium sulfamonomethoxine (MN), sodium sulfadimethoxine (DM), sodium sulfaphenazole (PH), and sodium sulfamerazine (MR) in vitro. A strain was regarded as a drug-fast one when its growth had been inhibited at a concentration of 100mcg/ml.Of 25 staphylococcal strains, 4 showed the fastness against MN, 5 against DM, 6 against PH, and 14 against MR. Susceptibility to MN and DM was higher than that to the other drugs in these strains. The 4 strains resistant to the action of MN had crossfastness against the other 3 drugs.Of 58 coli strains, about 70 per cent exhibited fastness against the 4 drugs and cross-fastness to them, too. The susceptible strains revealed a higher susceptibility to MN than to any other drug.
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