WASHINGTON (AP) -- A government advisory panel is considering whether the anthrax vaccine should be tested in children.

Health experts worry that terrorists could one day use the potentially deadly bacteria in an attack on the United States.

There's plenty of vaccine stockpiled just in case, and it's been widely tested on adults.

But since it's never been tested on youngsters, the question is whether to do research now so doctors would know if and how well children respond to the shots -- or just wait and, if there is an attack, offer the vaccine experimentally at that time.

That question is before the National Biodefense Science Board on Friday. The board gives advice to the Department of Health and Human Services on preparations for chemical, biological and nuclear emergencies.