HYSTORY OF PANDEMIES

the most lethal virus to date has been the 'Variola virus', which causes smallpox, today eradicated thanks to vaccines, it indicates, which has not caused outbreaks so concentrated in time, "but its survival throughout of the centuries it has catapulted him to be the number one murderer and calculate that he killed 300 million humans, apart from leaving people with marked skin, "he explains.

The measles has been known for more than 3,000 years and its main problem is the high rate of infection. It was killed more than 200 million people and has not yet been eradicated but it was controled by vaccines since 2001.

It started back in the 6th century, in the Byzantine Empire. This pandemic spreads throughout the empire and beyond. Although it is quite difficult to estimate, the Justinian Plague probably killed almost 25 million people in the Mediterranean until it was finally mitigated in the 8th century, and it destroyed up to a quarter of its entire population.

Spreads throughout the empire claims 5 million victims.
also known as the plague of Galen, because it was this famous doctor who described it, it was a smallpox or measles pandemic that affected the Roman Empire. It was carried by troops returning from the Near East campaigns

Black plague or black death refers to the most devastating plague pandemic in human history that affected Eurasia in the fourteenth century and peaked between 1347 and 1353. It is difficult to know the number of deaths, but in the 21st century estimates of 25 million people in Europe. This disease was transmitted by the rat.

It killed between 50 and 100 million. It was one of the most serious disease in modern history. Contrary to the previous two pandemics, which are understood to have killed hundreds of millions of people over the centuries, the Spanish flu killed 3 to 6% people in world's population .

It kills to 74 000 000 it does not disapear El VIH
It is spread when infected blood, infected semen, or infected vaginal fluids enter a person's body. ... HIV can be spread: by having sex (especially vaginal and anal) by sharing needles to inject drugs or get tattoos.

It has 511 945 infects but this number will increase, and it has 23 094 deads Until now, coronaviruses have been limited to humans. The origin of these viruses is unknown, but certain animals, such as bats, are known to act as reservoirs.

As in other viruses that cause pneumonia, when they are transmitted in humans, the infection usually occurs through the respiratory route, through the respiratory droplets that people produce when they cough, sneeze, or speak.