Abstract
Twenty isolates of Escherichia coli from cases of colibacillosis-affected birds in different farms in and around Madras city of Tamil Nadu State (India) were collected and subjected to resistogram typing. The resistogram types obtained from seven dyes and toxic chemicals were useful in differentiating the isolates. In all 14 different types were obtained with 100% showing resistance to phenyl mercuric nitrate and only 10% to 4-chloresorcinol. The resistance patterns towards other dyes and chemicals were, in descending order, copper sulphate, 95%, sodium arsenate, 80%, acriflavine, 70%, boric acid, 65%, and malachite green, 60%. The usefulness of this test as an epidemiological tool is discussed.
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