DALLAS (AP) — The first case of Ebola diagnosed in the U.S. has been confirmed in a man who recently traveled from Liberia to Dallas, sending chills through the area's West African community whose leaders urged caution to prevent spreading the virus. The unidentified man was critically ill and has been in isolation at Texas Health Presbyterian Hospital since Sunday, federal health officials said Tuesday. Ebola symptoms can include fever, muscle pain, vomiting and bleeding, and can appear as long as 21 days after exposure to the virus. Blood tests by Texas health officials and the CDC separately confirmed his Ebola diagnosis on Tuesday. The hospital is discussing if experimental treatments would be appropriate, Frieden said. Since the summer months, U.S.