29
22
Such tests are revealed only by laboratory tests of the milk.
For continued essential in the management of infected herds. infection can only be prevented in such herds by milking the infected cows last. In fact, one infected herd has been cleared and kept clear from this disease by these means. ordinary clinical examination is useless.
For this purpose an
(b) Diseases in man associated with cattle diseases.
49. Milk may be dangerous to public health either because it is infected when yielded by the cow, or because it is contaminated The diseases of dairy cattle during milking or subsequently. dangerous to man are tuberculosis, contagious abortion, and certain forms of mastitis, the associated human diseases being respectively tuberculosis (principally. non-pulmonary), undulant fever, and occasionally, in the case of mastitis, certain epidemic diseases generally associated with streptococcal infection, such as septic sore throat. Milk originally pure may become infected either with the germs of tuberculosis from dust or dung finding its way into the milk at the time of milking, or with throat, intestinal, or exanthema- tous diseases derived either from the milker, or from anyone engaged in the subsequent handling of the milk. Finally, milk is often infected in the home itself, the serious milk-borne disease, infantile diarrhoea, being due to infection there; but this lies outside our terms of reference.
(i) Tuberculosis.
50. Bovine tuberculosis is responsible for over 2,500 deaths This annually among the human population in Great Britain. estimate is arrived at by the determination of the type of bacillus in a number of cases where infected material is available and applying the percentage of bovine infection indicated thereby for each class of tuberculosis to the total deaths from that class. Such a calculation is made in the following table (table 3) :-
-
Deaths at
TABLE 3.
Deaths from tuberculosis in England and Wales, and estimate of deaths due to infection with the bovine type of tubercie
bacillus, 1931.
Estimated deaths from infection with bovine tubercle bacillus.
Percentage bovine in
Cases examined.
cases examined.
Variety of tuberculosis,
1
5-15 15 years Aged
years. years, & over. Aged Aged 0-5
Aged Aged 15
0-5
Total.
years. years. 0-5 5-15 years Total.
5-15
| years. years.
years Total. Aged
15
&
Aged
Aged Aged
18
15
years. years.
& 0-5 5-15 years Total.
over.
over.
29
Central nervous system.
Vertebral column
toneum ...
Intestines
---
08
North of England*
Rest of England and Wales ...
9,910
10,237
1-55
:
...
:
---
18,865
19,331
0.6
607
2,598 27.4 26-0 20-0 25-7
96
95
77
and
peri-
82.0
...
21.7 44
20.6
14-0
25.3
34
136
15.5
69
306
I
1
43 37-7
44-7 10-344.6
88
114 |
6
SI
...
1
13
...
3
327
197
888
85-7
48-2
23.8 46.2
TZ
33.3
15.0 17.4
56
42
20
33.3
9.1
nil
8.7
Co
TT
Other bones and joints Skin and subcutaneous tissues
dominal and bronchial Lymphatic system (ab- glands excepted) Genito-urinary system .... Other organs Disseminated
All forms...
...
...2,265 1,744 31,809 35,818
...
---
-
...
***
T
67.
...
6
**
...
352
183
9
יי་
TT
...
1
....
---
www
---
121
159
119
32
36
5
OT
41
88-2
2,147
The north of England consists of Durham, Northumberland, Cumberland, Westmorland, Yorkshire, Cheshire and Lancashire. In the same proportion as the sum of other cases.
Respiratory system-
30
No comments yet.
Private notes are available after approval.