The history of humanity with epidemics is long, and extends for hundreds and perhaps thousands of years, but ancient epidemics spread due to man’s ignorance of their discovery on the one hand, and his inability to confront them after their discovery on the other hand, and because of the spread of myths in treatment and sometimes poor personal hygiene for some of the inhabitants of the ancient world.
Today, with scientific progress, man has become able to confront these epidemics and eventually eliminate them, but their causes have multiplied and increased in complexity, and among these reasons are the primitive food habits of some civilized peoples, and the imbalance in the climate.
An example of epidemics is the Black Death epidemic that in the fourteenth century killed at least 200 million people around the world, and it is believed that it originated in or near China, then moved to Italy and then to the rest of Europe, and then to various countries the world.
As for the smallpox epidemic, it caused the death of 56 million people when it appeared in 1520, while the Spanish flu that appeared after the First World War (1918-1919), killed between 40 to 50 million people around the world, while the Justinian plague killed between The years 541 and 542 killed about 50 million people and may have caused the collapse of the Byzantine Empire.
As for the acquired immunodeficiency virus (AIDS), which appeared in 1981 and is still prevalent today, it has killed between 25 and 35 million people.
In 1855, another type of plague appeared, known as the third plague, and it is believed that it appeared in Yunnan Province, China for the first time, before spreading around the world, killing about 12 million people.
In the twenty-first century, several epidemics appeared, the most prominent of which was the emerging corona epidemic or Covid-19, which appeared in 2019 in China, and then managed to reach all countries of the world.
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