Clark Allen speaks at one of his daughters’ weddings. Allen died of the coronavirus in July despite being vaccinated. (Courtesy of Danielle Allen)

For years, the seven children of Clark Allen believed their father to be indestructible. Whether it was his chronic obstructive pulmonary disease or a series of car accidents from his terrible driving, his daughter joked last month that “nothing could kill that man.”

But as oxygen was being pumped into his lungs in a Florida emergency room, Allen, 84, who had been vaccinated against the coronavirus for months, asked daughter Danielle to repeat the surprising diagnosis that still left him in disbelief.