Resistance-Tester, an Invention for Rapid Detection of Drug-Resistant Strains from Cow Udders

Abstract

It is desirable that bacteriological investigation should be made completely before infected udders are treated. It is very difficult practically, however, to perform such investigation in the field, because several instruments and a long time are needed. So, in general, bovine mastitis is treated immediately with drugs without any previous bacteriological investigation. This is one of the reasons why drug-resistant strains have been induced from the causative bacteria of bovine mastitis.
Recently, the drug-resistant strains, especially those belonging to Staphylococcus aureus, have been rather frequently detected from milk samples drawn from mastitis udders.
The author has been studying these ploblems and invented a rapid means called the resistancetester to detect drug-resistant strains easily in the field.
This method needs no apparatus, no isolating media, nor an incubator. In the field the resistance-tester is employed immediately, a test sample being inoculated directly from the teat of an affected udder.
The presence of any resistant strain, with its sensitivity to the concentration of the drug, is recognized easily by change of the color of the tester. The resistance-tester is available to detect not only resistant strains in mastitis milk, but also those of many species of bacteria causing infection among human beings and animals so that any effective treatment might be performed correctly and economically.