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. 1974 Nov;28(5):793–797. doi: 10.1128/am.28.5.793-797.1974

Recovery of Heated Clostridium perfringens Type A Spores on Selective Media1

J T Barach 1, D M Adams 1, M L Speck 1
PMCID: PMC186826  PMID: 4374120

Abstract

The enumeration of Clostridium perfringens spores on sulfite-polymyxin-sulfadiazine agar (SPS), tryptone-sulfite-neomycin agar (TSN), Shahidi-Ferguson-perfringens agar (SFP), tryptone-sulfite-cycloserine agar (TSC), and TSN lacking antibiotics (BASE) was studied. The spores were heated at 105 to 120 C by the capillary-tube method. The media were about equally efficient for the enumeration of heat-activated spores. Efficiency of the media for the recovery of spores surviving heat treatments at ultrahigh temperatures varied as follows: TSC ≥ SFP > BASE > SPS > TSN. Greater recovery when survivors were enumerated on TSC or SFP was attributed to germination of injured spores by the lysozyme present in the egg yolk emulsion used in these media. Low recovery of survivors on TSN and SPS was due to both the absence of lysozyme and inhibition of injured spores by the selective agents of these media. Recovery of heated spores was reduced greatly by polymyxin, neomycin, and kanamycin, and slightly by sulfadiazine and D-cycloserine. The addition of lysozyme to SPS or TSN did not improve the percentage of heat-injured spores recovered because the selective agents of these media interfered with the action of lysozyme. The suitability of the selective media for the enumeration of survivors was greatly affected by the presence of certain foods.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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