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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) a parasitic nematode worm, Dirofilaria immitis, that lives in the heart and bloodstream of vertebrates
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014



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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
A variety of cardiovascular diseases has been reported in individuals from the Spheniscidae family, including ventricular septal defects, Dirofilaria immitis infection, pulmonary hypertension, and valvular dysplasia, ultimately resulting in congestive heart failure.
This drug is used to prevent heartworm disease caused by Dirofilaria immitis, which is spread through the bite of mosquitoes.
Morphometric analyses of canine blood microfilariae isolated by the Knott's test enables Dirofilaria immitis and D.
The need to evaluate alternative approaches is emphasized by the evolving susceptibility of Dirofilaria immitis larvae to heartworm preventatives containing macrocyclic lactones, such as ivermectin.
Studies on haemoparasitic infections of dog with special reference to Dirofilaria immitis. Ph.D.
Dirofilaria immitis; Culex, Aedes, Ochleratatus, Anopheles, Armigeres ve Mansonia cinslerine ait bircok sivrisinek turleri tarafindan tasinmaktadir (13, 31, 32).
Culex pipiens (Diptera: Culicidae), is the most common mosquito in rural and urban areas which in capable of transferring a number of pathogens i.e., West Nile Virus (WNV) (CDC, 2002; Turell et al., 2001;Alouani et al., 2009), avian pox virus, bird malaria pathogen, dog heartworm, Dirofilaria immitis, filarial nematode, Wuchereria bancrofti (Vinogradova, 2000) and St.
Dirofilaria immitis was not identified in the present large-scale survey, confirming previous results that this parasite has not yet established itself in Eastern Austria [10].
Preliminary results on the effect of tetracycline on the embryogenesis and symbiotic bacteria (Wolbachia) of Dirofilaria immitis. An update and discussion.
It is also active against ear mites, lice, gastrointestinal nematodes and prevents heartworm disease through its efficacy against Dirofilaria immitis larvae.