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It received the name of Spanish flu because the pandemic received more attention from the press in Spain than in the rest of Europe, since Spain was not involved in the First World War and therefore information about the disease was not censored. Spread all over the world,between 20 and 50 million people died.

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It was a serious infectious disease, contagious and with a high risk of death.The initial symptoms included fever and vomiting,followed in later days by the formation of sores in the mouth and skin rashes.The disease spread throughout history through periodic outbreaks: in 18th-century Europe, an estimated 400,000 people died each year from smallpox, with a third of survivors developing blindness. It is estimated that only in In the 20th century, smallpox killed up to 300 million people and 500 million in its last 100 years of existence.

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The Black Death was the most devastating plague pandemic in human history, affecting Eurasia in the 14th century and peaking between 1347 and 1353. Death tolls are difficult to know, but contemporary models estimate between 80 to 200 million in Eurasia and North Africa

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This plague is caused by the bacteria Yersinia pestis, formerly known as Pasteurella pestis. This disease is normally transmitted by rodents to humans.The black rat is a transmitter of bubonic plague, due to its proximity to human habitats. Spread throughout the world killing some 40 million people in one of the worst pandemics in history.

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Produces symptoms similar to those of the flu or cold, including fever, cough, shortness of breath.Symptoms appear two to fourteen days (incubation period), with an average of five days, after exposure to the virus.More than 5 million people have died from covid-19 around the world