FAQ About Heartworms

How Are Heartworms Transmitted?

Heartworm Disease

Heartworms are transmitted by mosquitoes. The adult female heartworm lives in the infected host and produces baby heartworms called microfilariae which circulate in the bloodstream. When a mosquito bites an infected animal, it picks up the microfilariae which develop into larvae within 10 to 14 days.  Then, when the infected mosquito bites a dog or another susceptible animal, these mature larvae enter the new host through the bite wound. In six months they will mature into the adult heartworm and the whole process starts again. The adult heartworm will live five to seven years in dogs and two to three years in cats

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