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Dirofilaria immitis, also known as heartworm or dog heartworm, is a parasitic roundworm that is a type of filarial worm, a small thread-like worm, and which causes dirofilariasis. It is spread from host to host through the bites of mosquitoes. Four genera of mosquitoes transmit dirofilariasis, Aedes, Culex, Anopheles, and Mansonia. [2]
Dirofilaria immitis, the dog heartworm, rarely infects humans. Filariasis is caused by parasitic nematodes. These worms are transmitted by infected mosquitoes of the genera Aedes, Culex, Anopheles and Mansonia. Recent evidence suggests that climate change has an influence in the spread of the parasitic disease and its vectors.
Dirofilariasis is an infection by parasites of the genus Dirofilaria. [1] It is transmitted through a mosquito bite; its main hosts include dogs and wild canids. These can give rise to granulomas in the pulmonary artery.
From Latin dīrus 'fearful; ominous' + fīlum 'thread', Dirofilaria is a genus of nematodes of the superfamily Filarioidea.The first known description of Dirofilaria may have been by Italian nobleman Francesco Birago in 1626 in his Treatise on Hunting: “The dog generates two worms, which are half an arm’s length long and thicker than a finger and red like fire.”
Löffler's syndrome is a disease in which eosinophils accumulate in the lung in response to a parasitic infection. The parasite can be Ascaris, Strongyloides stercoralis, or Dirofilaria immitis [1] which can enter the body through contact with the soil. [2]
Dirofilaria. Dirofilaria immitis (heartworm in dogs and cats, occasionally humans) Dirofilaria repens (parasite of dogs, and sometimes humans) Dirofilaria tenuis (parasite of raccoons, and rarely humans) Dirofilaria ursi (parasite of bears, and sometimes humans) Elaeophora. Elaeophora abramovi (parasite of moose in Russia)
Microfilaria of Dirofilaria immitis (heartworms) in a lymph node of a dog with lymphoma. This baby nematode is in a pillow of intermediate-to-large, immature lymphocytes exhibiting multiple criteria of cancer.
Microfilaria of Dirofilaria immitis (heartworms) in a lymph node impression smear from a dog with lymphoma. This baby nematode is snuggled down in a pillow of intermediate-to-large, immature lymphocytes, exhibiting multiple criteria of malignancy (1,000X magnification; courtesy Lance Wheeler) Microfilaria found in blood slides LACEN State Laboratory of Amazonas Brazil