In late 2021, Gail Seiler was enjoying life with her husband, adult children and her grandchildren. She was happily employed as a technology manager near Dallas after spending several years living in Europe.

All this changed in December 2021, however, when Seiler said her “nightmare began.” On Dec. 3, 2021, two days after testing positive for COVID-19, low oxygen levels led her to go to her local hospital, Medical City of Plano, Texas, for treatment.