DONALD KNOWLES: "You need a tick to transmit from one infected cow to the other. They won't transmit just by standing next to each other. You need a tick to move it between them."
疾病从一个动物传染到另一个动物需要有壁虱，动物贴近站立是不会传染的，必须有壁虱来传递疾病。
DONALD KNOWLES: "You need a tick to transmit from one infected cow to the other. They won't transmit just by standing next to each other. You need a tick to move it between them."
疾病从一个动物传染到另一个动物需要有壁虱，动物贴近站立是不会传染的，必须有壁虱来传递疾病。
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