Hi Herbert Welcome to the group. I did the immunoregulin protocol 1 from the home page of felineleukemia.org. I do think it helped my symptomatic cat. He lived another 1.5 years. I do not know anything about the SPA protocol, but I think the basic principal is the same as the immunoregulin, to boost the existing immune system.
We are happy to have you here. Sally in Virginia
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