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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 ?
The heartworm organism, Dirofilaria immitis, is transmitted by mosquitos, which ingest the L1 infective larval stage (also called microfilaria) while taking a blood meal primarily from an infected dog.
It is also active against ear mites, lice, gastrointestinal nematodes and prevents heartworm disease through its efficacy against Dirofilaria immitis larvae.
Dirofilaria immitis, colloquially known as the dog heartworm, is a nematode that utilizes dogs as its natural host.
Hematology, serum biochemistry, and urinalysis did not display any abnormalities and serology (snap ELISA, IDEXX[R]) for all of Leishmania infantum, Ehrlichia canis, and Anaplasmaphagocytophilum antibodies and Dirofilaria immitis antigen was negative.
In particular, a major zoonotic potential has been recently recognized for Dirofilaria immitis and D.
phagocytophilum, Ehrlichia canis, and Borrellia burgdorferi and antigen of Dirofilaria immitis, according to the protocol listed in the product insert.
Human pulmonary dirofilariasis (HPD) is caused by the transmission of infective third stage larvae of the canine heartworm, Dirofilaria immitis, during blood-feeding by infected mosquitoes.
Histochemical differentiation of microfilariae of Dirofilaria immitis, Dirofilaria repens, Dipetalonema sp.
9%; and 100% specificity, CI = 98%-100%) (10) which detects antibodies against Ehrlichia canis, Borrelia burgdorferi, Anaplasma phagocitophylum and Dirofilaria Immitis specific antigens.