Features March 2011 Issue

Are Heartworms Developing Resistance to Preventatives?

Are Heartworms Developing Resistance to Preventatives?

More dogs on year-round preventative are testing positive for heartworms.

In August 2010, representatives of the American Heartworm Society (AHS), the Companion Animal Parasite Council (CAPC), and experts in the field of nematode resistance met in Atlanta. Their goal was to discuss the possibility of heartworms becoming resistant to “macrocyclic lactones,” the scientific name for the heartworm preventatives we know as Heartgard (ivermectin), Interceptor (milbemycin oxime), Revolution (selamectin), and ProHeart (moxidectin).

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