(Adds background on Ebola in paragraphs 3,4) By Courtney Sherwood PORTLAND, Ore., Oct 31 (Reuters) - An Oregon woman being monitored for possible Ebola infection has been hospitalized after registering a high temperature, state health officials said on Friday. The woman, who was being monitored after traveling to an Ebola-affected country, has been placed in isolation and is not a danger to the public, the Oregon Health Authority said.