“I want to raise awareness of how serious the flu is.”

On February 2, Colette Giovanniello planned to take her twin daughters, Katie and Danielle, then 15, to a yoga class as part of their birthday celebration weekend. Katie woke up feeling sick and asked to skip. Five days later, she died of complications from influenza.

“It was all so sudden,” Giovanniello, of Leesburg, Virginia, told TODAY. “I didn’t ever think I would have to take my daughter — who is 16 — off life support from the flu. It was unthinkable.”

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