Outlines of dairy bacteriology, 10th edition: A concise manual for the use of students in dairyingRussell, H. L. (Harry Luman)
Science
Outlines of dairy bacteriology, 10th edition: A concise manual for the use of students in dairying
Russell, H. L. (Harry Luman)
Dairy microbiology
Inflammation caused by the invasion of the udder with specific
bacteria is usually of greater severity, the entire gland often
becoming involved. The secretion of milk may cease and the function
of the diseased quarters may never be restored. The milk in the less
severe cases may not be abnormal in appearance, but with increasing
severity, the nature of the milk changes, until it may be a watery
liquid. The milk of any animal suffering from any form of garget
should be rejected, as it may cause trouble, especially in children.
There is some reason to believe that organisms coming from cases of
garget have been responsible for the extensive outbreaks of septic
sore throat that have occurred in some parts of the country.
The milk of animals suffering from indigestion, diarrhea, abscesses
on any part of the body, as from those which have retained the
afterbirth should be likewise rejected. In short only the milk of
healthy animals should be used for human food; that from any animal
suffering from any disease or which is receiving medical treatment
should not be so used.
=Typhoid fever=. The most important disease germ, distributed through
the medium of milk, that is unable to produce a diseased condition
in the cow is the organism of typhoid fever. This malady is an
intestinal affliction of man, and the germ causing the same is found
abundantly in the dejecta, both solid and liquid, as well as in the
blood in certain stages of the disease. While the causal organism
does not leave the body through the expired air, it is found
abundantly in both the urine and feces. Therefore, the dejecta, and
any articles that may be soiled with the same become a positive
menace.
Many different methods of transmitting the contagion exist, such as
water, food infected in various ways, contact with infected persons,
and through the medium of milk. Milk is not so frequently the cause
of dissemination as the other factors, but where milk supplies
become contaminated, epidemics of considerable magnitude are wont to
occur. The danger from milk is also aggravated by the fact that the
typhoid bacillus is capable of withstanding considerable amounts of
acid, and consequently finds, even in raw milk containing the normal
lactic acid bacteria, conditions favorable for its growth. In a
considerable percentage of cases, the disease is not sufficiently
severe to cause the patient to take to his bed. These so-called
"walking typhoid" cases are particularly dangerous, because they
serve to spread the disease organism more widely.
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