A medium consisting of a MacConkey's base with added magnesium, calcium, cobalt, zinc, thiosulphate, novobiocin, iron dextran, Tween 80 and EDTA has been found highly selective for Salmonellaparatyphi B and most of the food poisoning salmonellae that commonly occur in Britain. Nearly all the normal faecal flora is inhibited.
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D.C. Shanson (1975) studied this question.
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