Spanish nurse : Another nurse assistant being observed for possible infection . Authorities are monitoring about 50 people . The nurse became first person to have Ebola outside Spain during this outbreak . Doctors Without Borders Norwegian staffer has Ebola , report says .
Madrid hospital : Another nurse assistant being observed for possible Ebola . Authorities are monitoring about 50 people . The assistant became first person to contract Ebola outside Africa during this outbreak . Doctors Without Borders Norwegian staffer has Ebola , organization says .