I'll admit it: I get frustrated when people come in with influenza. ...Especially if the professor is easy-going and flexible.

My lab partner came in with the flu one afternoon. She went home and
recovered. I went home, had a fever of 106, permanently lost 15% of my
lung function, and some time later ended up in the hospital for two
weeks. I have asthma and CF-- to lose that much lung capacity in a
single hit is disappointing. (Sounds small, though it made the
difference between being able to climb a flight of stairs and ....well,
having to fall up the stairs. XD )



Just my personal experience. Lots of grey areas, but those who do
decide to come to class or work should at least make an honest effort
to contain all those fluffy viral particles.