The first case report of subcutaneous dirofilariasis caused by in Thailand.

Dirofilariasis is a rare zoonotic disease which is commonly caused by two species; and . Humans are accidental dead-end hosts of the parasites, and the infection is mainly asymptomatic. Here, we report the case of a 54-year-old Thai woman who experienced a painful left shoulder nodule and eosinophilia for 1 month. An excisional biopsy of the nodule revealed a degenerated filarial nematode compatible with adult females of the species. Molecular identification of the partial 12 mt rRNA gene of the worm confirmed that the causative species was , a zoonotic filariasis that causes subcutaneous dirofilariasis in dogs and cats. To the best of our knowledge, this was the first reported case of subcutaneous dirofilariasis caused by in Thailand. This increased concerns about zoonotic filariasis from natural animal reservoirs in Thailand.