Dirofilaria is a filarial worm. Female worms measure up to 30cm in length and males up to 15cm. The worms have a life-span of 5-7 years. Up to 250 worms may establish in the heart and [[Respiratory Parasitic Infections - Pathology#Dirofilaria immitis|pulmonary arteries]] of dogs and cats. | Dirofilaria is a filarial worm. Female worms measure up to 30cm in length and males up to 15cm. The worms have a life-span of 5-7 years. Up to 250 worms may establish in the heart and [[Respiratory Parasitic Infections - Pathology#Dirofilaria immitis|pulmonary arteries]] of dogs and cats. |