A small infection that can only reproduce inside living cells. viral infections in animals summon an immune response that usually eliminates the infecting virus. Immune responses can also be created by vaccines, similar to an artificial immune response to that specific viral infection. free resources
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67,000 dogs in 6 years?!

If none are spayed or neutered, a female dog, her mate and their offspring can produce 67,000 dogs in 6 years.