Abstract
An electronic counting system using hydrophobic grid‐membrane filters (HGMF) and the HGMF Interpreter was evaluated for its usefulness in enumerating nalidixic acid resistant Salmonella in frozen chicken caeca. Salmonella recovery was equivalent on both Hektoen Enteric and EF‐18 agars. However, the color of the Salmonella growth on EF‐18 agar was more easily differentiated by the HGMF Interpreter electronic counting system. the study showed that a 4 h resuscitation on a nonselective medium was required in order to maximize the subsequent recovery on Hektoen Enteric agar, though not on EF‐18 agar. Using the EF‐18 agar as the Salmonella selective medium, a method was established that recorded counts of nalidixic acid resistant Salmonella rapidly and easily in electronic data files, for subsequent retrieval and manipulation.
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