THE HEAT DISINFECTION OF STREPTOCOCCUS FAECALIS AND STREPTOCOCCUS LACTIS
Open Access
- 1 April 1952
- journal article
- Published by Wiley in Proceedings of the Society for Applied Bacteriology
- Vol. 15 (1) , 8-14
- https://doi.org/10.1111/j.1365-2672.1952.tb00002.x
Abstract
SUMMARY: The heat resistance of a number of strains of Streptococcus lactis and Str. faecalis at 60° in Ringer's solution and separated milk has been determined and the Decimal Reduction Times (D.R.T.) calculated.Heating in separated milk at 60° enabled Str. lactis to be sharply differentiated in most cases from Str. faecalis. The latter gave D.R.T. values usually much above 3 min. while the former gave values usually under 1 min. and certainly less than 3 min. Single tests might give misleading results with certain strains.The log. survivor‐time graphs of both species were not always straight lines over all their length. A preliminary period of slow death was frequently observed.Keywords
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