Ascaris takes most of its nutrients from the partially digested host food in the intestine. There is some evidence that it can secrete anti-enzymes, presumably to protect itself from digestion by the hosts' enzymes. Children are often more severely affected.
Ascariasis
Toxocariasis
Acariasis
Schistosomiasis
Strongyloidiasis
Myiasis
Monorchism
Intestinal capillariasis