http://medicalxpress.com/ en-us Medical Xpress internet news portal provides the latest news on Health and Medicine. Scientists have discovered why some people may be protected from harmful parasitic worms naturally while others cannot in what could lead to new therapies for up to one billion people worldwide. http://medicalxpress.com/news/2011-05-worm-discovery-billion-people-worldwide.html Medical research Thu, 05 May 2011 10:08:57 EST news223808899