cdcThe Centers for Disease Control and Prevention (CDC) confirmed on Tuesday that a patient being treated at a Dallas hospital has tested positive for Ebola, the first case diagnosed in the United States. The patient left Liberia on September 19 and arrived in the United States on September 20, CDC director, Dr. Tom Frieden told reporters at a press conference Tuesday. It’s the first patient to be diagnosed with this particular strain of Ebola outside of Africa. “[The patient] had no symptoms when departing Liberia or entering this country. But four or five days later on the 24th of September, he began to develop symptoms,” said Frieden. The patient, who was in the U.S. visiting family in Texas, initially sought care on September 26, but was sent home and was not admitted until two days later. He was placed in isolation at Texas Health Presbyterian Hospital of Dallas, where he remains critically ill, according to Frieden. More