A case of heartworm (Dirofilaria immitis) in an imported dog and a report of the occurrence of canine microfilariae in the Republic of South Africa.

A dog imported from Australia had microfilaria of Dirofilaria immitis in its blood. This is the second report of these microfilariae in dogs imported into the Republic of South Africa. The treatment of this dog is described. Other filarial worms which are known to occur in the RSA are discussed.