It all started innocuously enough in the week leading up to Christmas in 2019 with a runny nose, a cough, and some fussiness. All pretty standard for our one-year-old daughter, who spends time with other kids at daycare sharing germs more readily than toys. Over the next few days, however, the cough got worse and the fussiness increased. We were still thinking it was just a cold until the lethargy hit. She wasn’t eating or drinking well, she had spiked a fever that wouldn’t level out, and seeing our normally active child—a girl who wasn’t even still when she slept—lying down listlessly ...