How are heartworms transmitted?

Heartworms are transmitted via a mosquito bite. And then, that mosquito injects baby worms into the dog's skin. And they migrate into the dog's skin for about two months till they hit the bloodstream. And then, they end up in the pulmonary arteries or arteries of the lungs seven months later. That tissue stage, or those first two months, is where the heartworm preventatives destroy that infection before it gets any further. That's the only time that those are an effective heartworm control or prevention.

Heartworms are transmitted via the mosquito. A mosquito first bites an infected dog, then the heartworm actually gets in the mosquito's body and reproduces, and then it is put back into another dog through injection.

Heartworms are transmitted through mosquito bites. When a mosquito bites an infected dog, it picks up microfilariae (baby heartworms). These microfilariae develop into infective larvae within 10-14 days. The mosquito then bites another animal, depositing the larvae into the new host. In regions with a high mosquito population, such as Mississippi, heartworm transmission occurs year-round.

Heartworms are transmitted through mosquitoes. Mosquitoes take a blood meal from a dog, which contains the heartworm larvae, and then they go and drink from another dog where they inject some of that blood with the microfilaria into the next dog.