Government health officials are sounding an alarm that only a fraction of the people who need flu shots the most are getting them.
Their figures show just one in five babies and toddlers are getting flu vaccines.
The warning comes from officials who are worried a string of mild flu seasons and confusion over vaccines in recent years are deterring people from a simple lifesaver.
Manufacturers expect to ship more than 130 million doses of flu vaccine in coming months. And, officials say it's not too late to get vaccinated later, in the winter.
The flu kills about 36,000 Americans a year, and lands about 200,000 in the hospital.