What natural disaster is it and what are its consequences?

Epidemic, respectively. epidemic incidence of disease, represents a greater accumulation of disease incidents in time and local context. An extremely large epidemic spanning most of the world is called a pandemic.

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Words to add: virus, disease, plague, epidemic
An is a designation for the massive spread of a to a population, which may not be fatal. Some epidemics reappear at certain time rhythms that are associated with weather change, mutation, or extinction of a resistant population. Throughout history, mankind has been hit several times by and flu epidemics.