I'm sick as a dog. My chair has made it clear he wants "butts in seats", and was reluctant to let me teach remotely once, last week.
Pretty sure he would have denied the request if I hadn't added, "...Or I can take a sick day and you can find an adjunct or other faculty member to teach today's lecture."
I'm still sick. I can cancel class, but then students will fail exams. There is no real possibility of anyone providing the content the students need.