When diseases break out in a town, a hospital is used to reduce the length of the sickness and stop it from spreading. A physician needs to be working at a hospital to make it effective.
Each hospital can only treat 30 patients at once. You'll need more than one hospital and physicians to treat larger outbreaks.
When citizen become sick they'll stop working at their job. If no hospital is available, they will stay near their homes, but still travel around town to collect food and supplies. Moving among the population when sick will cause disease to spread.
If there is room in a hospital, the sick citizen will stay there for the length of the disease, and they will have a reduced chance of dying.
Clicking on the hospital will show how many patients are being treated in the building.
Clicking on the button will toggle enabling or disabling treatment at the hospital. When the hospital is no working, citizens will try to find other hospitals to treat them, or return home.