Bacillary white diarrhœa of chicks / by Thomas Dalling and H.R. Allen.

  • Dalling, Thomas.
Date:
[1924?]
Catalogue details

Licence: In copyright

Credit: Bacillary white diarrhœa of chicks / by Thomas Dalling and H.R. Allen. Source: Wellcome Collection.

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    4. Ages of chicks susceptible. Age when fed. No. fed. Died. 1 day 3 3 2 days 3 3 3 days 3 3 4 days 3 3 5 days 3 1 6 days 3 0 5. Time between infection and appearance of disease. Experiments showed that symptoms of disease appear in from twenty-four hours to three days following ingestion of the culture. In one case a period of ten days elapsed. Deaths occur in twenty-four hours to five days following the appearance of symptoms. Sources of infection discussed in the paper are : (a) Through the egg from the “ carrier ” hen. (b) Chick to chick, (c) Indirect methods. (d) “ Carrier ” hens infecting “ normal ” hens, (e) Spread through the male bird. (/) Feeding chicks on boiled eggs from incubator. Experi¬ ments are in progress to clear up these points ; the following only have been concluded :— 1. Chick to chick. Chicks fed. Deaths. Chicks in Contact. Deaths. (a) 3 3 6 4 (b) 3 V / 3 6 1 Chicks were fed when one day old, arid the in-contact chicks were placed with them when one day old. This experiment also shows the effects of crowding chicks when exposed to infection. Group (a) were crowded in a small box ; Group (b) had ample accommodation. 2. Retention of infection by litter, etc. May 19, 1924.—Two chicks in box fed with culture B. pullorum.. Both died. Box left untouched. June 19, 1924.—Three chicks placed in box. Two died from bacillary white diarrhoea, B. pullorum being recovered from them. The view is held in this country that there may be several diseases* grouped under the term bacillary white diarrhoea showing identical clinical symptoms and post-mortem lesions. Diagnosis of carrier ” fowls is being worked out. Serum agglutination tests have been made on large numbers of birds, and experiments are in progress to verify the reliability of this test as a means of eradicating the disease. Egg albumin agglutination tests are also in progress and favourable results are