As a casual you get 0 sick days, if you don't work, you don't get paid. For part-time and full-time you start with 5 sick day, and you increase those days through seniority.
Nurses get many sick days, as many as they need really. But management will call you and pressure you and make you feel guilty when you come back to work. They say stay home if you are sick, but they really dont mean. Attendance monitoring is strictly enforced.