Journal of the Japan Veterinary Medical Association
Online ISSN : 2186-0211
Print ISSN : 0446-6454
ISSN-L : 0446-6454
Studies on Psychrophilic Bacteria
II. Source of Contaminating Bacteria in the Process of Milk
Hidenobu OKAZAKIM. Bessho
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1970 Volume 23 Issue 3 Pages 140-144


A survey was conducted on the source of contamination with psychorphilic bacteria in a milk plant where ultra-high temperature pasteurization was carried out.
1. Psychrophilic bacteria were detected from all the samples tested of city milk stored at 5°C for 7 to 10 days. They were mostly of the genus Pseudomonas.
2. They were found in such portion of the process as farther than the bottling machine.
3. The bottling machine was negative for the swab test of psychrophilic bacteria immediately after swabbing, but was positive after storage at 5°C for 10 days. The capping machine was negative in both cases.
4. The falling bacteria studies in the bottling room included Pseudomonas at the rate of 14.9%.

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