Most people on the globe are very frightened of the Covid-19 pandemic which has swept across the world.
Roman soldiers who had been at war in the east brought home a bad virus, which killed over a 100 000 people in the period AD165-180.
During the Russian Plague, 1770-1772, the virus depleted St Petersburg and triggered riots against Archbishop Ambrosias who tried to stop people from going to churches to worship, 100 000 people died.
During the pandemic of 1889-1890 many people died and that virus spread abroad.
If a historical time lapse of a virus is calculated from the known periods humans were infected by these pandemics, minus the unknown Miazoqou case mentioned above, the average time for a virus to completely disappear is 3.8 years.
