DAVID SHEPARDSON THE Centers for Disease Control and Prevention (CDC) will impose new public health requirements for U.S. visitors who have recently been in the Democratic Republic of the Congo (DRC) or Guinea because of concerns about Ebola, the agency said on Monday. Starting this week, the U.S. government will require travelers from DRC and Guinea to fly into six U.S. airports. Airlines will collect and transmit passenger information to the CDC for public health follow-up for all passengers boarding a flight to the United States who were in DRC or Guinea within the previous 21 days. Recently, less than…