Ebola: The 2014 Ebola epidemic is the largest in history, affecting multiple countries in West Africa. Although the risk of an Ebola outbreak in the United States is very low, CDC and partners are taking precautions to prevent this from happening. One travel-associated case was diagnosed in the United States on September 30, 2014. On October 12, 2014, a healthcare worker at Texas Presbyterian Hospital who provided care for the index patient has tested positive for Ebola. CDC confirms that the healthcare worker is positive for Ebola.