I beleive in the state of florida not sure if its nation wide, but when you call in sick your employer must let you stay home without fear of losing your job (up to X days) and they are not allowed to even ask you why. (because its patient doctor privileged) My employer allows up to 3 days without a doctors note, (basicically just a paper from a doctor thats an absentee excuse paper) and then how ever many days the doctor puts on the paper is how long you get off.