A federal advisory panel says Americans 65 and older should get newer, souped-up flu vaccines.

NEW YORK -- Americans 65 and older should get newer, souped-up flu vaccines because regular shots don't provide them enough protection, a federal advisory panel said Wednesday.

The panel unanimously recommended certain flu vaccines that might offer more or longer protection for seniors, whose weakened immune systems don't respond as well to traditional shots.

Health officials say there is persuasive research indicating some of the new shots work better in older adults, especially at preventing flu-related hospitalizations.

Panel members said seniors should get regular flu shots if the newer ones aren't available.