How threadworms spread
Threadworms spread when their eggs are swallowed. They lay eggs around your anus, which make it itchy. The eggs get stuck on your fingers when you scratch. They can then pass on to anything you touch, including:
- clothes
- toys
- toothbrushes
- kitchen or bathroom surfaces
- bedding
- food
- pets
Eggs can then pass to other people when they touch these surfaces and touch their mouth. They take around 2 weeks to hatch.
Children can get worms again after they've been treated for them if they get the eggs in their mouth. This is why it's important to encourage children to wash their hands regularly.