Khanh Nguyen, who had a severe case of COVID-19 and was on a ventilator for about 6 weeks, checks his heart rate after working out at his home on Thursday, Nov. 4, 2021, in Las Vegas. More than 19 months later, Nguyen has made an almost full recovery barring some chest tightness. (Ellen Schmidt/Las Vegas Review-Journal) @ellenschmidttt