Dirofilaria is a zoonotic disease, where human beings become the accidental host of the worm. Three types of worms have been reported and they are D. immitis, D. repens and D. tenuis. D. immitis occurs world wide, where as repens and tenuis are found endemic in certain countries, D. repens is found in Asia, Africa and America. Natural host of the parasite is dog and mosquitoes become the intermediate host and finally human beings are the accidental host.
