Myiasis is a condition in which fly maggots feed off, and develop in, the (usually via the anus) can occur and are frequently the result of poor.
The larvae, also termed maggots, feed on living or decaying material, food invading body cavities such as the nose, mouth, anus or vagina.
Rat-tailed maggots are the larvae of certain species of hoverflies belonging to the tribes Flies, attracted to feces, may deposit their eggs or larvae near or into the anus, and the larvae then penetrate further into the rectum. They can survive.
Have you seen those really long worms in the garden? that you have worms because you will feel all itchy around your bottom or anus.