An epidemic occurs, for example, when the virulence of a particular pathogen changes: a virus mutates and becomes more contagious.
Paleoendemisme merujuk kepada spesies yang pada suatu ketika dahulunya membiak secara meluas tetapi sekarang hanya terhad di kawasan yang lebih kecil.
Endemic taxa can also be classified into autochthonous, allochtonous, taxonomic relicts and biogeographic relicts.
A pandemic is similar, but it spreads farther, affecting multiple regions or continents.
Yellow fever, smallpox, measles, and polio are prime examples of epidemics.
This article was translated from German.