Filter paper impregnated strips using cephalothin at 30 and 60 µg/ml and triphenyltetrazolium chloride at 20 mg/ml were prepared and used in the typing of catalase-positive Campylobacter species. There was no difference in the sensitivity of campylobacters to cephalothin at 30 µg/ml and 60 µg/ml. Results were as reported by other workers except for a C. jejuni strain which was resistant to the triphenyltetrazolium. The technique is nevertheless inexpensive and the results are consistent and easy to interpret.
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