Epidemic prevention requires the construction of an epidemic prevention station, and villagers assigned to it can use fuel to generate purifying fires.
During the storm season, the villagers will use purifying fire to eliminate cysts (note that purifying fire can also be produced during the storm season).
When there are many cysts in the later stage, one epidemic prevention station may not be enough.
It is safer to have two epidemic prevention stations + build a fire hydrant in a building far away from the epidemic prevention station (from which the epidemic prevention personnel can directly take the purifying fire)