Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Pin worm or enterobius vermicularis is the very tiny worm which lives in the area around anal canal. They won t reside in the intestine it self. Yes they are highly infectious it can infect the other members if the one member is infected. It can also spread through respiratory tract. Yes it is a bad thing to have worms inside you, it may cause severe itching around the analcanal. Clothing should be washed separately of infected person. Bed sheet should be changed daily until the infected person cured. Albendazole can be given to the infected person. If the infected person is more in numbers than all the members requires a treatment simultaneously. There are no other treatment methods other than drugs. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.