The specific transfer factor(TF) is extracted from spleen of canine that have been immunized with attenuated canine distemper vaccine(CDV).

本试验用犬瘟热弱毒苗免疫的犬，提取了特异性犬脾转移因子（TF） 。

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The rabies vaccine also needs to be given yearly, although due to the small size of ferrets, the rabies and Canine Distemper vaccines can't be given at the same time.

狂犬病疫苗和犬瘟热疫苗一样，每年必打，不过由于貂儿体积小，所以两种疫苗不能同时接种。

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