Q. My dog was given heartrworm Antigen K9 vaccine and interceptor monthly. is this double prevented

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A. Unless this is very new, to my knowledge there isn't an antigen vaccine against heartworm infections. One of the most common tests for heartworm disease tests for the antigen the body produces to try and fight off the infection. I recommend consulting with your vet about this. If she did indeed receive a vaccine and not just a test, then using interceptor on top of that may have the possibility to interact negatively.

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