The common drone fly is reported to have caused accidental myiasis.
Myiasis in humans is usually an accident and is caused by the ingestion of contaminated uncooked food or water containing fly larvae.
This occurs when fly larvae inhabits a living host by accident, usually from ingestion of contaminated foods.
In humans, myiasis can be caused in four ways: intestinal or gastric, nasal, auricular, or anal.
Gastric or intestinal is the most common.
Most reported myaisis has been reported in countries where nutritional and sanitary conditions are unsatisfactory.
There are very few reports of intestinal infestation from India, and Africa.
Clinically the symptoms are variable, including cases that are asymptomatic, but usually abdominal pain, nausea and vomiting are some symptoms one with myiasis might face.

Dronefly larvae are able to survive in the gastric acids due possibly to the fact that they are adapted to living in polluted environments.
Myaisis becomes apparent to the host when they notice the larvae in their bowel movements.
The common drone fly is reported to have caused accidental myiasis. Myiasis in humans is usually an accident and is caused by the ingestion of contaminated uncooked food or water containing fly larvae. This occurs when fly larvae inhabits a living host by accident, usually from ingestion of contaminated foods. In humans, myiasis can be caused in four ways: intestinal or gastric, nasal, auricular, or anal. Gastric or intestinal is the most common. Most reported myaisis has been reported in countries where nutritional and sanitary conditions are unsatisfactory. There are very few reports of intestinal infestation from India, and Africa. Clinically the symptoms are variable, including cases that are asymptomatic, but usually abdominal pain, nausea and vomiting are some symptoms one with myiasis might face. 
Dronefly larvae are able to survive in the gastric acids due possibly to the fact that they are adapted to living in polluted environments. Myaisis becomes apparent to the host when they notice the larvae in their bowel movements.
Eristalis tenax