Experimental study on the growth of Salmonella and coli-aerogenes bacteria in pure and mixed cultures, in a fermentor, in two different enrichment media: Sodium selenite and tetrathionate broth

Efficiency of Selenite Cystine and TT Enrichment Broths for the Detection of Salmonella

“…That many different factors affect the recovery of salmonellas from foods may help explain such different recommendations. The type of food or feed being tested (Silliker & Taylor 1958;Galton et al 1968), the number of salmonellas present in the sample (Taylor & Schelhart 1968;Cox & Mercuri 1978), and the type of competing bacteria present (Montford &Thatcher 1961;Edel & Kampelmacher 1969;Hugues et al 1978) and whether or not pre-enrichment is used (Taylor & Silliker 1962) are all factors to be considered in determining which enrichment broth is preferable. Time (Anon.…”

“…Fagerberg & Avens (1976) noted that selenite-containing media are better for recovering certain serotypes and tetrathionate media for recovering others, but that no one medium is best for all serotypes. Evidence exists, however, that tetrathionate inhibits competing organisms better than selenite (Hugues et al 1978). Therefore, if the sample being tested contains large numbers of competing bacteria, TT would appear to be the medium of choice.…”

Salmonella and Other Enterobacteriaceae Found in Commercial Poultry Feed

“…Knowing what types of Enterobacteriaceae are present could be an important factor in determining the most effective bacteriological procedures for recovery of Salmonella from these materials. It has been demonstrated that the types of competing bacteria present may affect the recovery of Salmonella and that these are an important factor to consider in selecting the most effective enrichment media (Hugues et al, 1978;Bailey et al (1981). E. coli are normally present in the chicken gut in large (Cox et al, 1975(Cox et al, , 1979.…”