A virulent pathogen has infected your body and causes you ongoing harm. Each disease has its own individual effects, with some being more severe than others.
Recovery
Assuming they aren’t fatal, most diseases are overcome with time. You can recover from them earlier with a successful System Check (UC Fortitude, DT is set by the disease). You can make one Check per day of rest.
Recovering from a disease removes the pathogen and any inflicted Status but does not heal any Vitality lost to it or other Afflictions it causes.