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Studies on Lactobacillus Thermophilus

Department of Bacteriology, Oregon State College Corvallis, Oregon

ABSTRACT

An additional isolation of Lactobacillus thermophilus is reported. The organism agrees in almost every respect with the original description. Additional characteristics are recorded. The organism grows poorly on the nutrient agar used in routine milk platings, and the indistinct filamentous colony may be "pin-point" in size. The colony can easily be distinguished from the lens-shaped "pin-point" colonies of the thermoduric streptococci. Much better growth is obtained when Bacto-Proteose peptone is substituted for ordinary peptone.

As in the original isolation Lactohacillus thermophilus is found to be the causative organism of high bacterial counts in a pasteurized milk supply. It would appear that the organism is not of common occurrence in milk. The particular growth requirements and the relatively short period of viability characteristic of the organism may also explain why it has not been isolated more frequently.