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<blockquote data-quote="matthew" data-source="post: 4551640" data-attributes="member: 169"><p>The skin test relies on the stimulation of the immune system. If theanimal is overwhelmed with disease, then it has no immune respoanse to make. That is very rare and known as an 'anergic' animal. </p><p></p><p></p><p></p><p>The amount of cfu (colony forming units) of TB bacteria in any cattle lesions is low. Thus in the field, with regular testing and slaughter, cattle to cattle spread is low. Most cattle lesions are in the lymph nodes. </p><p>Walled up lesions are like walnuts and the tough jacket prevents the escape of bacteria. This is known as 'latentcy' and at that time the animal (or human) is not infectious. When the lesions break down, they will be.</p><p></p><p></p><p></p><p>^^ This. The whole OVS / MHS system of carcase examination is geared to finding TB. </p><p>If TB nodules are found in more than two(?) places, then the whole carcase is binned. If not, the affected lymph nodes are removed and the meat is sold. Salvage value to the ministry exceeds £3.8m annually.</p></blockquote><p></p>
[QUOTE="matthew, post: 4551640, member: 169"] The skin test relies on the stimulation of the immune system. If theanimal is overwhelmed with disease, then it has no immune respoanse to make. That is very rare and known as an 'anergic' animal. The amount of cfu (colony forming units) of TB bacteria in any cattle lesions is low. Thus in the field, with regular testing and slaughter, cattle to cattle spread is low. Most cattle lesions are in the lymph nodes. Walled up lesions are like walnuts and the tough jacket prevents the escape of bacteria. This is known as 'latentcy' and at that time the animal (or human) is not infectious. When the lesions break down, they will be. ^^ This. The whole OVS / MHS system of carcase examination is geared to finding TB. If TB nodules are found in more than two(?) places, then the whole carcase is binned. If not, the affected lymph nodes are removed and the meat is sold. Salvage value to the ministry exceeds £3.8m annually. [/QUOTE]
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