Five Myths & Misunderstandings
But my cat stays indoors, so she is safe, right?
It only takes one mosquito to infect a cat, and because mosquitoes can get indoors, both indoor and outdoor cats are at risk and should receive heartworm preventive medication. In a North Carolina study, 28 percent of the cats diagnosed with heartworm were inside-only cats.
The severity of heartworm incidence as shown in this map is based on the average number of cases per reporting clinic. Some remote regions of the United States lack veterinary clinics, therefore we have no reported cases from these areas.