Report of Council : 30th (1928) / National Association for the Prevention of Tuberculosis (Great Britain).

  • National Association for the Prevention of Tuberculosis (Great Britain)
Date:
1928
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Report of Council : 30th (1928) / National Association for the Prevention of Tuberculosis (Great Britain). Source: Wellcome Collection.

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    Films of miliary tubercle in the lung and of more advanced and destructive disease, with cavities, are next presented. | But victory is not necessarily on the side of the invaders, and the film goes on to deal with the means of defence which the body puts into action against the invading bacilli, and by which they can be overcome. The defence is the work of special cells, among which are the white cells of the blood (leucocytes). The circulation (highly magnified) of the cells of the blood in the vessels is shown and the movements of the heart together with the action of the leucocytes in dealing with invaders. The property of phagocytosis, by which the white cells surround and absorb the bacilli is illustrated. Giant cells are pointed out and the fibrous capsule, formed from the massed cells, which walls off the area of disease and prevents its spread is demonstrated. PRODUCTION OF CRERTIFPIE Dy MILK “800 -teet), This film shows the methods tn use at the Experimental Datry Farm, Gracemount, under the Dtrectton of the Royal Victoria Hospital Tuberculosis Trust for the Preventton of Tuberculosts. ‘Certified milk,’’ i.e., the highest grade of milk, tubercle-free, must be produced from cows which have passed a prescribed Oa test and veterinary examination. The whole herd must be submitted to the tuberculin test at intervals of six months, and to veterinary examination not less than three times every year. Every animal added to the herd must be tested immediately before admission. The milk must be bottled on the farm and be delivered, bottled, to the consumer, Certified milk must not at any time contain more than 30,000 organisms per c.c. or any coliform organisms in 0.1 c.c. It should contain not less than 3.5 per cent. of butter fat. Certified milk must not at any time during production be treated by heat. In order to produce certified milk it is essential that the herd should lie under sound physiological conditions. Accordingly, it is the practice of Gracemount Farm to have the cows outside daily, even during the winter months, as much as is feasible. The cow-shed is large; and perfect lighting, zwration and cleanliness are ensured. The cows are groomed regularly and their hindquarters, tails and udders frequently clipped. To prevent contamination during the process of milking, considerable care is exercised in the toilet of the cow. 4]
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