Missouri Bird Flu Case Raises Prospect of Human Transmission The New York TimesThe Bird Flu Outbreak Takes a Mysterious Turn WIREDOfficials await testing clues from Missouri H5 avian flu case as Michigan reports more affected cows University of Minnesota Twin CitiesCDC says no ‘clear source’ of bird flu infection in Missouri patient NBC NewsInquiry into unexplained bird flu case in Missouri broadens to a close contact STAT