What Does the Latest AHS Incidence Map Show Us?

Marisa Ames, DVM, DACVIM (Cardiology)
President, American Heartworm Society

Every three years, the American Heartworm Society (AHS) conducts a heartworm incidence survey with U.S. veterinarians and shelters. Through this survey, the AHS gathers testing data from heartworm tests conducted the previous calendar year by veterinarians and shelters across the country. The Society also surveys participants for insights on what factors are driving incidence trends in their practice areas. The AHS then takes the data and creates a color-coded U.S. map that shows the density of diagnoses.

16 April 2026

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When warm weather hits, you will want to ramp up your heartworm education efforts. To help make this goal easy--and fun--the AHS has created a new set of posters to print or post on your social pages.

To save or print a poster, just click on the image below, then click on the “download” button and save the PDF file.
To save a poster for use on your social pages, simply open the downloaded poster, then right click on the file and follow the menu instructions to save the file as a JPEG image.