👉 Myiases are a type of parasitic infection that occurs in birds and other animals. The term "myiasis" comes from the Greek word "miosis," which means "to close." In other words, myiases can be called "closed-in" diseases because they affect the body's tissues and organs. Myiases are caused by a type of protozoan parasite known as a nematode. These parasites feed on the blood of an animal to grow and multiply,