( CNN ) -- Dr. Rick Sacra , an American missionary doctor infected with the deadly Ebola virus , has improved slightly while being treated in Omaha , Nebraska , his wife said . `` Rick is very sick and weak , but slightly improved from when he arrived yesterday , '' Debbie Sacra said Saturday in a press release issued by SIM , the Christian mission organization for which Sacra works . `` He asked for something to eat and had a little chicken soup . '' Debbie Sacra and the couple 's 22-year-old son visited him for 25 minutes by a video link at Nebraska Medical Center , according to the press release . Sacra landed Friday morning in Omaha . Sacra , the third American with Ebola to return to the United States for treatment , was stationed in Liberia when he was exposed to the virus . Debbie Sacra said she and her husband want to keep the focus on the Ebola crisis in West Africa . `` We do n't want this story to be about Rick , '' she said . `` The story is the crisis in West Africa . That is what is most important . The world is coming to this fight late . '' Ebola is a highly infectious disease that can kill up to 90 percent of the people who catch it . The CDC estimates there have been more than 3,000 cases of Ebola and more than 2,000 deaths since 1976 .
Dr. John Sacra , an American missionary doctor , was infected in Liberia . He 's being treated at Omaha 's Nebraska Medical Center . He is the third American to return home for treatment .