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Heartworm Superbug?
Should we be worried about resistance
In a map by the American Heartworm Society, darker areas have higher incidence of heartworm.

Heartworm disease is a horrible and potentially deadly disease that is fortunately preventable with medication. However, in recent years, animals in the Gulf region have been testing positive for heartworm, despite being on a prevention medicine. This has many people worried about a potential resistant superbug.

In response to the growing cases, the American Heartworm Society and Companion Animal Parasite Council met earlier this year to "explore the potential relationships between resistance to heartworm products and veterinary and pet owner compliance, loss of product efficacy and heartworm testing and treatment protocols." 

For instance, 50 percent of people who buy heartworm preventative do not give the medication to their dogs as directed. The efficacy of heartworm preventative is greatly compromised if not given as intended.

The meeting concluded that more research is necessary, but that the investigation should not lead to dropping heartworm medicine, since year-round use is still the most effective way to prevent the deadly disease.

In human healthcare, there’s so much talk of antibiotic resistant supeprbugs that I avoid excessive medications and vaccines when possible, for both myself and my dogs. However, heartworm preventative is one medication I don’t skip with the pups. It’s such a serious disease and I hope that the possibility of a superbug is unfounded.

For more information on heartworm prevention, symptoms, and endemic areas, visit the American Heartworm Society website.

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JoAnna Lou is a New York City-based researcher, writer and agility enthusiast.
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Submitted by Carolyn | October 27 2010 |

That's a very scary thought. My dog has started coughing very occasionally; vet suggested heartworm. She is on medication 12 months of the year since we are in Belize where there is NEVER a break from mosquitoes, so I discounted that idea right away. If there is a superbug, then maybe I have to reconsider...

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