As a teacher at an university, I am not allowed to call in sick really.
If there's an emergency or I am serious-sick, I am allowed to cancel only ONE class.
If more, I have to find and pay for the sub out of my paycheck-- $40 hourly. (the university does not take care of the subsitutes teachers).
They do frown if I have to find a sub more than two times.
The class is only 10 weeks so it does affect the students' signing skills if the regular teacher's not being there for them.
so I am stocking up on my Vitamin C and ZINC!