Pandemics over the ages

Since human beings occupied the world diseases have also come into existence and spread among society. Although outbreaks of certain diseases occur frequently only a few reach the level of a pandemic. According to the World Health Organization Pandemic is a term used for a certain disease that quickly spread to various parts of various regions (continental or global) through sustained contamination. In this regard the severity of the disease is not determinant but its power of contagion and its geographical proliferation. And they left a huge trail of deaths. They are the devastating Black Death and the Spanish Flu. Just like the Covid-19 outbreak now the two previous pandemics also originated from animals - bats and rats probably. The symptoms of all three are identical or similar: muscle pain fever tiredness insomnia inflammation of the trachea difficulty breathing severe headache and lack of concentration. The positive side of situations like these is that science always advances in studies that contribute solutions to medicine.