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Human societies as a whole are attached to the difficulties imposed by the forces of nature that can be, otherwise, extremely destructive, as evidenced by natural disasters and, in this case, the silent enemy of the pandemics that, Yesterday and today, they have ravaged entire nations. Just remember the ravages that once caused strains or viruses such as typhus, measles, bubonic plague, leprosy, yellow fever, tuberculosis or HIV, among many others that continue to evolve.

For many experts in the area of public health and viral diseases, the last known great pandemic was the so-called Spanish flu of 1918. The first World War was over, surviving soldiers return to their places of origin and thus very quickly spread the virus that would end the lives of millions of people. In the words of (Pumarola & Antón, 2018, p. 63):