Breakthrough COVID cases are uncommon and often mild, but not always
Vaccines available in the U.S. prevent severe COVID illness, but the number of fully immunized people testing positive are rising as the more contagious delta variant spreads.
(Cindy Elizabeth | The New York Times) Elaina Cary-Fehr at her home in Austin, Texas, on Aug. 5, 2021. Cary-Fehr's father, Isaac, was transferred to a long-term care facility after being hospitalized with COVID-19 in June.