More than 100 children have died from the flu so far this season

What's happening: The influenza B strain, which tends to be more common in children, has caused the majority of pediatric deaths.

• The strain carries gastrointestinal symptoms, including vomiting, which can influence one's ability to take antivirals to shorten the flu's duration, CNN reports.

Of note: A report out Thursday showed preliminary data that the flu vaccine for the 2019-20 season has reduced doctor visits by 45% overall, and 55% for children. This is consistent with previous seasons, the CDC says.

• CDC officials indicate it's not too late to get the flu vaccine as it could mitigate severe symptoms, even if one ends up infected with the virus.

Go deeper: Why we panic about coronavirus, but not the flu