cdcThe head of the Centers for Disease Control and Prevention told Congress Thursday the current Ebola outbreak is the largest of the disease ever, developing into an international crisis that “has now come to the United States.”  “It is inevitable someone will fly from West Africa to the United States with Ebola symptoms,” CDC Director Thomas Frieden acknowledged in a rare congressional hearing held during the August recess. He affirmed a repeated concern of the United Nations’ World Health Organization that the virus has up to a 21-day incubation period, meaning an infected person could get on an airplane in West Africa before symptoms appear and the person becomes contagious. More