Safranek said public health officials are interested in the kind of tracking methods and data produced by companies like Walgreens. He emailed the company seeking information on how the company compiles its data.

"I'm intrigued by it," he said. "I think they can help us."

Safranek recommended the use of antivirals as a means of shortening the course and severity of the flu and of reducing its spread. He also reminded Nebraskans to take precautions to avoid getting or spreading the bug, including washing hands, staying home when sick and avoiding sick people.

But he and O'Keefe said the best way to prevent flu is to get the flu shot. It's not too late in the season, and there are a number of reasons to do it.

» While you might still get the flu if you get the shot, it will be less severe. That difference could be enough to keep you out of the doctor's office, the hospital — or worse.

» Most of this year's vaccines cover four strains, so you'll be protected if another strain dominates later in season.