The cytotoxic immune response of puppies to feline sarcoma virus induced tumors was studied. Neonatal puppies were compared with adolescent dogs. Three different types of cytotoxicity were investigated: complement dependent cytotoxicity, T-cell-mediated cytotoxicity and antibody dependent cellular cytotoxicity. The relationship between the spontaneous regression of the sarcoma and the development of the immune system of the puppies is discussed.
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