[Report 1936] / Medical Officer of Health, Cambridgeshire County Council.
- Cambridgeshire (England). County Council
- Date:
- 1936
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: [Report 1936] / Medical Officer of Health, Cambridgeshire County Council. Source: Wellcome Collection.
70/86 (page 64)
![the meantime. (Six weeks must usually elapse between the taking of a sample for biological examination and the receipt of the result). In the herd where the cow was detected and slaughtered, a positive sample was obtained from each of three groups of cows besides that containing the slaughtered animal. Further sampling from individual cows in the three groups resulted in the detection of one positive cow which was slaughtered, but the cows responsible in the other two groups were never detected. In three of the remaining eleven cases, not only was the veterinary surgeon unable to detect the offending cow at once, but further sampling proved negative and no cow was ever detected as being responsible for the infection of the original sample. In one of these instances, five cows had been sold fat for slaughter between the taking of the original sample and the veterinary surgeon's visit, so that it is possible that the offending animal was one of these. In two further cases, the samples taken from one group of cows in each herd proved positive, showing that the original positive result was probably well founded, but on further sampling of the milk of individual cows in each group no ])ositive result was obtained and again the offending animal remained undetected. In three instances, samples from a group in each herd proved ))ositive and samples from individual cows in the groups were also found positive (in one case microscopically), but in only two cases, including that where the bacilli were found microscopically, was the cow actually slaughtered under the Tuberculosis Order. In the other it was said to have died from other causes. In one case, a sample of milk from an individual cow M-as found positive on biological examination, but the animal was not slaughtered under the Tuberculosis Order, as it](https://iiif.wellcomecollection.org/image/b2908944x_0072.jp2/full/800%2C/0/default.jpg)
