Coworker's been off from work the past week. He had time off at Christmas and New Year and has been spending more time with family. They all got sick. Everyone's fully vaxxed and boosted. I asked him how it's been, and he noted just quite tired. Plenty of mucus and phlegm previously, and fever for awhile. Thankfully his parents (mom's mid-60s and dad's mid-70s) are fine. Some other relatives seemed alright too, as does his older sister. Her husband (older sister's) though has had the most challenging time. Tough time with sleep / rest ... lots of vomiting. He's late-40s. Just had the 1 booster thus far, others have had 2.
Coworker himself is responsible though. Big on masking up and doing lots of cleaning / following protocols at work. It will be good to have him back next week.
He's healthy which definitely helped him - early 40s - runs, plays tennis & men's basketball league. Does stationary bike at home, etc.