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<blockquote data-quote="Bright Raven" data-source="post: 1609435" data-attributes="member: 27490"><p>May I add this in simple words? A vaccine contains parts (or the whole) of the germ (pathogen). An example would be proteins from the germ. These parts are the "antigens". The immune system of the calf responds to these antigens by producing "antibodies". These antibodies remain in the body to act as "identifiers". So when the calf is exposed to the real pathogen, the antibodies identify the pathogen and "tell" the leukocytes to go to war against the pathogen.</p><p></p><p>This process can be initiated by a vaccine or the real live pathogen during an infection.</p><p></p><p>In the case of colostrum, it is, so to speak, a "borrowed" immunity. The calf borrows the immunity from mom. The calf "borrows" mom's antibodies. The problem with this immunity is that at the end of the "loan period", it is no good. This is when people refer to a calf having a "crash of the immune system". What they are finding out is that all along this period, the calf's immune system is actually at work developing its own immune response.</p><p></p><p>Btw: immunity can be against the organism or against the toxin the organism secretes.</p></blockquote><p></p>
[QUOTE="Bright Raven, post: 1609435, member: 27490"] May I add this in simple words? A vaccine contains parts (or the whole) of the germ (pathogen). An example would be proteins from the germ. These parts are the "antigens". The immune system of the calf responds to these antigens by producing "antibodies". These antibodies remain in the body to act as "identifiers". So when the calf is exposed to the real pathogen, the antibodies identify the pathogen and "tell" the leukocytes to go to war against the pathogen. This process can be initiated by a vaccine or the real live pathogen during an infection. In the case of colostrum, it is, so to speak, a "borrowed" immunity. The calf borrows the immunity from mom. The calf "borrows" mom's antibodies. The problem with this immunity is that at the end of the "loan period", it is no good. This is when people refer to a calf having a "crash of the immune system". What they are finding out is that all along this period, the calf's immune system is actually at work developing its own immune response. Btw: immunity can be against the organism or against the toxin the organism secretes. [/QUOTE]
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