I think if I were an employer I'd rather people took time off sick than came in and made me sick.
I made sure everyone at work knew I was proper poorly and did very little actual work just to make the point.
I have no time, however, for people who have "flu" for a day! Or declare they have tonsillitus or bronchitus or someotheritus without so much as a wander past the doctors surgery. No, you have a cold or a sore throat.
A friend of mine on facebook has had a week's worth of statuses varying between telling us how very ill she is and how much fun she's had on yet another night out. Erm, you're clearly not very ill then.
I am obviously much better because I'm getting catty!