Please see your other post.
thanks,
Pinworms and Threadworms are the same.
They are common throughout the world and they live in the anus. They look like very thin white threads, hence their name.
The female comes out in the evening to lay her eggs on the outside of the anal canal and this is what causes all the itching.
Hygiene is extremely important. Wash your hands before eating any food and after using the toilet.
Try not to scratch your bottom. The eggs that cannot be seen by the naked eye, stick to the fingers and finger nails, when you then eat without washing your hands, or put your fingers to your mouth, the eggs travel down to the intestinal tubes where they hatch and the cycle starts over again.
Eggs of threadworms can be stuck to door handles and other objects or on people peoples fingers. So if your friend has touched any contaminated door handle (that could be anywhere not just in his house) that is how he will have got infected with these worms. Don't share towels and bedding, which need to be washed on a hot setting.
Sometimes the thread worms do travel away from the anal canal and can cause other problems.
If these worms were just causing an itching bottom and coming out from the anus, sometimes they are visible on the stools, then I would have suggested getting a medication from the pharmacy to treat them.
The important thing is to get these worms identified especially as they are coming out of other parts of his body. Worms that enter the lungs can cause breathing problems and that is why your friend needs medical attention urgently to identify the parasite and get the correct medication immediately.
Best wishes.
Your friend needs immediate medical attention and urgent diagnosis of the parasites and worms so that they can be identified he can be given the correct medication to kill these parasites and worms.