Mindy Maggio, a physical therapist, takes the blood pressure of Mark Ivanisin, a U.S. Army Corps of Engineers Pittsburgh District operations supervisor, during a physical therapy appointment to strengthen his lungs and body at a pulmonary rehab center in Warrendale, Pennsylvania, Dec. 17, 2021. Earlier this year, Ivanisin spent 52 days in the hospital fighting for his life against the COVID-19 virus and the pneumonia that followed. (U.S. Army Corps of Engineers Pittsburgh District photo by Michel Sauret)