A/an is a sudden and widespread outbreak of a disease within a population group or area

The answer to this question would be an epidemic.

The epidemic is a sudden widespread of disease of infectious disease, in a population. In an epidemic, the disease might exist before the sudden widespread but the number of case is not that many. In epidemic case, the healthcare provider should make a team to investigate it immediately to stop the increases of the victim.

B

To wear the full equipment.