The heartworm (Dirofilaria Immitis) parasite is making inroads in southern and eastern Europe, but fortunately dogs and cats are not yet infected with heartworms everywhere in Europe. Heartworms are not ingested from the environment like roundworms, for example. Heartworm is transmitted only by mosquitoes. The heartworm larvae (microfilaries) are transmitted to the dog or cat by these mosquitoes, when they sting. These heartworms will grow into adult worms in and around the heart and then cause physical complaints. Unfortunately, dogs only show symptoms after about 5 to 7 months. In cats, adults will often not develop.
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