Heartworm is a parasitic roundworm (Dirofilaria immitis) that is spread from host to host through the bites of mosquitoes.The heartworm is a type of filaria, a small thread-like worm.

• 心蠕虫是一种圆形线状的寄生虫，是犬恶丝虫的俗名，通过蚊虫叮咬在宿主之间传播。