American Heartworm Society Releases New Heartworm Incidence Map

Texas leads the nation in heartworm incidence, with cases reported nationwide

APEX, NC – The American Heartworm Society (AHS) Incidence Survey has revealed the highest U.S. heartworm rates are once again in the traditional heartworm strongholds of the Gulf Coast and southeastern states. At the same time, the survey and new heartworm incidence map also identified several new and troubling trends thousands of miles from so-called heartworm epicenters.

The AHS conducts a nationwide canine heartworm incidence survey every three years, working with veterinary practices and shelters that submit data from heartworm antigen tests run over the previous year. The latest survey was conducted in early 2026 and reflects data from heartworm testing conducted throughout 2025.

07 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.