In March 2014, the World Health Organization (WHO) reported an outbreak of Ebola virus disease in the West African country of Guinea. Additional cases have since been reported in the countries of Liberia and Sierra Leone, as well as Nigeria and Senegal. The cases reported in Nigeria and Senegal are considered to be contained, with no further spread in these countries, but new cases continue to be reported from Guinea, Liberia, and Sierra Leone. To date, there have been more than 9,200 reported Ebola cases in West Africa, with more than 4,500 deaths.
In September 2014, the Centers for Disease Control and Prevention (CDC) reported the first laboratory-confirmed case of Ebola diagnosed in the United States, in a person who had traveled from Liberia to Dallas, Texas. The patient passed away on October 8, 2014. Two health care workers at Texas Presbyterian Hospital who provided care for the patient has also tested positive for Ebola, and have since been isolated and are receiving care.