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1. A parasitic filarial worm (Dirofilaria immitis) that is transmitted by mosquitoes and infects the pulmonary arteries and often the right side of the heart of dogs and other canids and sometimes other mammals, including cats.
2. The condition resulting from infection with heartworms, characterized by respiratory symptoms and fatigue.


(Animals) a parasitic nematode worm, Dirofilaria immitis, that lives in the heart and bloodstream of vertebrates



1. a parasitic nematode, Dirofilaria immitis, transmitted by mosquitoes and invading the heart and pulmonary arteries of dogs and other canids.
2. the disease caused by infection with heartworm.
References in periodicals archive ?
Interceptor, another heartworm preventive, may have one advantage over other products: its dosage of active ingredient (milbemycin oxime) is five times the minimum amount that has been determined to prevent heartworms; the higher dose is used to control intestinal parasites as well.
The American Heartworm Society (AHS) and the American Association of Feline Practitioners (AAFP) have teamed up to get this urgent message out to cat owners through the KNOW Heartworms campaign (www.
One of the reasons given was that Merial had conducted a laboratory study showing "that heartworms had developed resistance to the 'Heartgard Plus' active ingredients, ivermectin and/or pyrantel; and that Merial was actively working to reformulate 'Heartgard Plus' to make it more effective by adding additional drugs to the combination product.
Unfortunately, heartworms don't always go away with medication.
Their goal was to discuss the possibility of heartworms becoming resistant to "macrocyclic lactones," the scientific name for the heartworm preventatives we know as Heartgard (ivermectin), Interceptor (milbemycin oxime), Revolution (selamectin), and ProHeart (moxidectin).
The dog was on monthly heartworm prevention and contracted the heartworms in 2014.
a portion of the heartworm lifecycle occurs in the mosquito when immature heartworms molt and form infective (l3) larvae that mature and become adult heartworms in the host.
The key words included dirofilariasis, human, pulmonary; heartworms, human, canine.
The heartworms had damaged Rupert's lungs, and he was still intolerant of exercise for about six months after he had been cleared by the vet to run and play again; if he tried to chase a ball, sometimes he would suddenly collapse, panting, and I'd burst into tears.
The American Heartworm Society recommends this practice as the best way to prevent heartworms and other parasites like roundworms and hookworms.
The only way a dog can get heartworms is by being bitten by an infected mosquito.
An appreciable number of heartworms were noticed in pulmonary artery, vena cava and right ventricle of the heart appearing as spaghetti (Fig.