plague
Plague, also known as pandemics, refers to large and contagious epidemics that infect people or other species in large areas or globally. But the disease caused by pandemics does not necessarily cause a lot of people to die, such as cancer so far no treatment, resulting in many of the world's population death is not a pandemic, because cancer is not infectious. Therefore, according to the World Health Organization, the occurrence of a pandemic should meet the following conditions: ▪ A new pathogen appears in the population ▪ Infection of the disease causes serious illnesses ▪ Pathogenic infections, especially between people