So far, it's not been a tough flu season. Still, more people have been vaccinated this season than in seasons past, according to government data.

The age group that has seen the biggest increase in vaccinations against the flu this season is children, aged 6 months to 17 years, according to the U.S. Centers for Disease Control and Prevention.

Hispanic and black children are reporting the highest levels of flu protection, the CDC reports. About 43 percent of Hispanic children and 36 percent of black children have gotten flu shots, the agency said. About 34 percent of non-Hispanic whites have gotten the shot.

The flu season usually peaks in February, although it's only been seen in 30 states so far this season.

"We're seeing little flu across the country right now," said Anne Schuchat, director of the CDC’s National Center for Immunization and Respiratory Diseases.

Influenza infects anywhere from 5 to 20 percent of the population every year, said Larry Marsh, a Barclays Capital health care analyst.