A U.S. official in Normandy preparing for President Barack Obama's upcoming visit has been hospitalized with swine flu, French authorities say.

An official at the Calvados region administrative headquarters says 11 other members of the U.S. delegation were placed in isolation for 24 hours in their hotel.

The official says the 54-year-old woman was hospitalized Friday in the city of Caen. The official was not authorized to be identified publicly.

Caen is not far from the beaches where Allied forces landed June 6, 1944, in the D-Day invasion. Obama is coming to the area for the 65th anniversary of the invasion next week.

The French health monitoring agency InVS says 20 cases of swine flu have been confirmed in France.