Symptoms of deadly flu strain spreading across US tend to 'escalate rapidly,' doctor says

It started with a cold, and then it turned deadly.

The grieving family of Dylan Winnik of West Palm Beach, Fla. is in shock after their 12-year old son died Tuesday from complications related to the flu.

Dylan’s family said cold symptoms developed just a day after the seventh-grader was playing at a birthday party on Sunday, according to a report from Local10 News. By Tuesday, his condition worsened and a neighbor called 911. When sheriff's deputies arrived at the home, Dylan already had died

Dr. Margarita Rohr from NYU Langone Health told Fox News the most common form of flu being reported this season, Influenza A (H3N2), "is particularly worrisome as symptoms tend to escalate rapidly, especially in children and older adults."

"The short duration time, from the diagnosis of flu with onset of symptoms leading rapidly to death may be attributed to the particular strain of virus we are currently facing," she said.

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