I understand that mosquitoes are the primary vectors of heartworms. Can a dog be infected in other ways?

1 Answer 1


There do not appear to be any natural non-mosquito vectors of Heartworm (Dirofilaria immitis). In fact it appears there are only about 60 species of mosquito that can be a vector for the parasitic roundworm, this is out of about 3,500 known species of mosquito grouped into 41 genera.


The Wikipedia article was mostly used as reference for the scientific name, it does not clearly state one way or the other on additional vectors. On researching further, the article at parasitesandvectors.com, which taken together with others I found imply "we looked for other vectors and have not found one yet". A person with medical training and equipment could transfer an infection from one dog to another, but that seems outside of the question. If there are host vectors other then the 60/3500 of mosquito species, they either have not yet been found, or they are poorly document and I did not find reference of them. While you are unlikely to find any reliable reference that clearly states "Mosquitoes are the only possible vector", This quote says it as clearly as can be expected.

Dirofilaria immitis (Di) is a filarial worm transmitted by mosquitoes (Culicidae) to carnivores and other hosts.

Source - parasitesandvectors.com

  • I already voted, but to back up James, my Veterinary consult lists only mosquitos as the known vector. If there are others, I'm not finding them.
    – Joanne C
    May 10, 2014 at 15:25
  • Now, you probably think I'm a pain in the ass and I ask of you to forgive me for my excessive skepticism, but I still can't find the phrase "we looked for other vectors and have not found one yet"(after doing a ctrl+f). May 10, 2014 at 15:51
  • @shooting-squirrel LOL, that was the implied message I got from combining several references. One in particular seemed to roll it up, new infections where occurring in an are that did not have a history. I will see if I can find it again and add it. May 11, 2014 at 11:06
  • @shooting-squirrel, I am pretty sure the other thing I was looking for was on parasitesandvectors.com also, while looking for it I found the quote I just added. Empirically there is no practical way to "prove" that there are "no other vectors". Tomorrow a new discovery could be made that some other vector does exist, but currently every time they look for a vector, the find a mosquito and stop looking, in much the same way as you stop looking for your keys once you have found them. May 11, 2014 at 11:29

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