Morgan Shaver was shocked to learn she had COVID-19 in July. The virus made her so sick it caused acute hypoxemic respiratory failure, sending her to the hospital for five days. Ultimately, Shaver's fiance also caught the virus. He spent several days in the hospital too. They were not vaccinated, but Shaver, a Tipton County, Tennessee, resident thought she would be safe because she always wore a mask at work. “It was very unexpected,” she said. The latest surge of the coronavirus might have caught Shaver by surprise, but medical experts say it was painfully predictable and emblematic of this stage of the pandemic.