Washington Post:

An Energy Department employee who was part of the advance team for President Obama's recent trip to Mexico is suspected of having contracted the swine flu virus and transmitting it to his family in Anne Arundel County, the White House said today.

The man is on the security staff of Energy Secretary Steven Chu, who traveled with Obama to Mexico on April 16. He is believed to have transmitted the highly contagious virus to his wife, son and nephew, press secretary Robert Gibbs said...

The staffer worked a dinner Obama attended in Mexico City, Gibbs said. After the White House learned of his exposure to the virus late last night, Gibbs said, the man "was asked specifically if he ever came within six feet of the president" during the dinner.

"The answer," Gibbs told reporters, "was 'no.' "