Second wave of flu virus happening now — CDC

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The Centers for Disease Control and Prevention reports that while flu season is winding down, a second strain that is more severe in younger children remains prevalent.

Officials with the Wisconsin Department of Health Services said the lineage of Influenza B isn't included in this season's vaccine, and said you can still get both strains.

Seventeen states reported widespread flu activity for the week ending March 11.

Though the H3N2 strain generally leads to more severe illness and hospitalizations than B strains, these B strains tend to be more severe for younger children. It is possible for people who've been sick with one strain of the flu to get a different strain in the same season.

"But we still are seeing the Influenza B virus still kind of trailing along, lingering along a little bit", Bolly says.

And many doctors are warning there could be a second peak to the flu season.

However, Influenza B cases have jumped, making up almost 60 percent of the country's flu cases reported.

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However, the new CDC report says the number of influenza B cases have surpassed influenza A.

"Illness associated with influenza B can be just as severe as illness associated with influenza A and influenza B is usually worse for younger children", Nordlund said.

At this time, the influenza A strain had accounted for 75 percent of all cases.

"Some of the patients that we're seeing actually had Influenza A and now they're coming back with Influenza B", Bolly says.

Unfortunately, if you've already had the flu this season, you're not necessarily out of the woods. "The CDC and other experts recommend that you still get vaccinated while influenza is circulating", said Dr.

Among adults, 7.8 percent of all deaths reported for the week were pneumonia- and flu-related, the CDC reported, noting that these data are always two weeks delayed.

Overall, fewer people are going to see a doctor for the flu than during the height of the season at the beginning of February.