The number of older people hospitalized with the flu has risen sharply, prompting federal officials to take unusual steps to make more flu medicines available and to urge wider use of them as soon as symptoms appear.

The U.S. is about halfway through this flu season, and “it’s shaping up to be a worse-than-average season” and a bad one for the elderly, said Dr. Thomas Frieden, director of the Centers for Disease Control and Prevention.

It’s not too late to get a flu shot, and “if you have symptoms, please stay home from work, keep your children home from school” and don’t spread the virus, he said.