Mexico has posted large signs at border crossings and airports warning travelers about the Ebola outbreak in Africa, symptoms of the disease and how to prevent the spread of the virus. "We're also handing out fliers," said Dr. Puertas Rincones, director of health services and sanitation for Chihuahua in the border city Ciudad Juarez. "I don't know anything about Ebola symptoms," said Miguel Torres, a Juarez resident as he waited outside a Chihuah…