The Impact of Heartworm Disease
Every three years, the American Heartworm Society (AHS) gathers data on heartworm testing to understand the impact heartworm is having nationwide, as well as in specific regions. Testing data from thousands of veterinary practices and shelters is used to create a detailed map showing the average number of heartworm-positive cases per clinic.
Below is the incidence report from 2011 and 2013. Heartworm is becoming more and more prevalent as the years continue on.