centers for disease control and prevention note a recent uptick in cases in the southeastern united states. the cdc is bizzing planning for the 2010 season. >> spring break, that's when we had a lot of problems last year. we have lots of international travelers. the southern hemisphere may be gearing up for their season. >> over the past year h1n1 claimed estimated 12,000 lives in the u.s. that's one third the average number of americans who do i each year from seasonal flu. but experts say it's who is affected that's cause for concern. >> this was a really hard year for younger people. we think about five times more people under 65 died from the h1n1 virus than would typically die from seasonal flu. >> researchers are working on new technology to produce vaccine at the cellular or molecular level. current vaccine is safe and effective but slow and unpredictable. >> we say you need to have more than enough vaccine to have