11-17-2012 08:39 AM
They don't have to but they seem to get cured faster if they stay home (and don't give it to others).
You can call in sick through your phone.
Good Luck and Happy Simming
12-27-2012 09:06 PM
As well as keeping them home, you can also send them to the hospital and get a vaccination for 250 simoleons. They should be flu-free for the year. This also can cure your sim if they are already sick.