There are 3 types of worms that cause infestation – Threadworm, Roundworm and Hookworm. Threadworm is the most common- particularly in school-aged children who then spread it to the rest of the family.
A few ways to limit the risk of worms are things like trimming and cleaning fingernails regularly, washing hands after toileting and before eating, and washing linen and toys in hot water.
Threadworms look like tiny lengths of fine, white cotton. The worm lives in the lower intestine but emerges at night to lay eggs around the anus, this can cause an itchy bottom for the person. Other symptoms include being irritable, not sleeping well and having a decreased appetite. Once laid the eggs can then be shed or scratched off ingested.