Like a tornado through his body
Mark Ivanisin, a U.S. Army Corps of Engineers Pittsburgh District operations supervisor for navigation on the Allegheny River, walks back to his car with an oxygen tank after 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)

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Photo by: Michel Sauret |  VIRIN: 211217-A-TI382-0774.JPG