[Report 1968] / Medical Officer of Health, North Riding of Yorkshire County Council.

  • North Riding of Yorkshire (England). County Council.
Date:
1968
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1968] / Medical Officer of Health, North Riding of Yorkshire County Council. Source: Wellcome Collection.

    52/104 (page 50)
    At the request of producers 227 samples were taken from individual cows, 33 of which were found to be infected with Brucella abortus. School Milk Supplies The results of sampling of school milk are given in the following table :— Brucelh i abortus Designation Samples taken te St JL UUOp te tia late¬ st bac nlli M.I FT. Biolc >gical Pass Fail Pass Fail Neg. Pos. Neg. Pos. Neg. Pos. Pasteurised 955 865 55 946 5 — — — — — — Untreated 68 62 5 — — 49 — 67 1 49 — The most significant feature in these statistics was the failure of 5 samples to pass the phosphatase test. This test indicates whether heat treatment has been carried out at sufficient temperature to destroy any pathogenic organisms in milk ; immediate action was taken to safeguard the consumer. Methylene Blue Test failures on milk which has passed the phosphatase test do not indicate the same degree of potential hazard to the consumer as the test is affected by extraneous influences i.e. temperature during storage and delivery. Only one sample of untreated milk supplied to a school showed evidence of Brucella abortus infection ; an alternative source of supply was found immediately. The number of schools supplied with milk under the Milk in Schools Scheme is now :— Pasteurised Milk . . 231 Untreated Milk . . 17 248