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(CNN) - If you haven't received your flu shot yet, the Centers for Disease Control and Prevention says now is the time to make sure you're protected. The agency says flu season is ramping up early this year - for the first time in almost a decade.

According to CDC Director Dr. Thomas Frieden, H3N2 is the predominant strain this year. It's generally associated with a severe flu season. "The strains we are seeing suggest this could be a bad flu year," Frieden said. "But this year's vaccine is an excellent match with the influenza that's circulating."

Dr. Melinda Wharton, Acting Director of CDC's National Center for Immunization and Respiratory Diseases, says current flu activity is highest in the South.

"We're seeing the highest level in the southeastern and south central region of the United States," she said. "Five states had high levels: Tennessee, Mississippi, Alabama, Louisiana and Texas. Moderate levels of illness have been recorded in Missouri and Georgia."

Flu cases typically peak in February, according to the CDC.

The CDC says about 123 million doses of the vaccine have already been distributed to health care providers, and about 112 million people have already been vaccinated.

Among doctors, nurses and pharmacists, about 80% to 90% have already been vaccinated, Frieden said, along with almost half of all pregnant women. The number of children being vaccinated has also increased. "I encourage everyone 6 months and up to get vaccinated," Frieden said.

Each year there are approximately 200,000 hospitalizations for flu-related illnesses.

The first case of flu has been reported in Pima County - tune in to News 4 Tucson this evening for a full report.