From NBC's Athena Jones
In his daily briefing, White House press secretary Robert Gibbs said a member of the advance team for Energy Secretary Chu went to Mexico and developed flu symptoms. He and three members of his family tested positive for type A influenza and that it's probable they have H1N1. Further testing is being done by the CDC, and all four sick individuals experienced only mild symptoms and all four have recovered.
This person, in fact, has been cleared to go back to work by doctors and is working today.
Gibbs also said that Chu has not exhibited symptoms and there are no plans to test him. Same is true of the president, he added.