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The black plague dates all the way back to the almost mid 1300's. The black plague originates from Afro-Eurasia. It came to Europe in October 1347 when 12 ships from the Black Sea docked. It was shocking when people gathered at the docks only to find that most of the sailors aboard the ship were dead. The sailors that were still alive however were covered in black boils that were oozing blood and pus.

Boccaccio wrote that he believed the plague was spread by "the mere touching of clothing." Some even believed that it was a punishment from God. In reality though the plague was spread through rats and fleas. The disease was also (unfortunately) efficient, those who went to bed the night before feeling perfectly fine could be dead by time morning came around.

Over the course of a five year plague spreading in Europe causing many deaths, the total of deaths may have been somewhere between 75 to 200 million people. Which may have been a third of their population.

The black plague is still around to this day but these days modern sanitation workers and public health workers have kept it under control.

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The flu is a common illness that can be found in babies, children, teens, and adults. It's a fairly common illness to have.

It's scientific name is Influenza and it's a virus that was first discovered in 1933. The Flu was a pandemic and was called the Spanish flu. It only really lasted 1-2 years.

The flu came around in three waves starting during WW1. No one is quite sure where exactly the virus first emerged but they do know that cases started popping up in March among people in the military. The movement of these soldiers helped to spread the virus from the US to Russia, Africa, Asia, and New Zealand.

The first wave of the flu was mild and died down pretty quickly but the second wave was more lethal with people with the flu experiencing pneumonia. Some people even ended up dying within two days of experiencing the symptoms. But all well that ends well for a bit at least as social distancing measures were laid down it eventually died down before coming back again.

The third wave began in winter and the early spring of 1919 but was not as deadly as the second wave was but it still claimed a lot of lives.

The Spanish Flu was worst pandemic of the 20th century causing around a total of 12.5 million deaths.

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The polio epidemic didn't exactly occur until the later part of the 19th century but some believe that polio is an ancient disease and there's proof for it.

A story about a priest in ancient Egypt dictates that the priests' lower right leg and his foot felt like they were withering.

In the 19th century there were only small groups of people who had polio cases that were getting reported but still only as small cases.

The first true epidemic was 14 cases in Norway in 1864 and 13 cases in Northern Sweden in 1881. Around the same time people began to think that polio was a contagious disease. The third epidemic erupted when 132 cases came from the USA in Vermont.

Carl Kling and his colleagues from Stockholm did some research on the  matter and found that the virus was in people's throat and the small tissue of their intestines.

The peak in the epidemic was in 1952 when estimately 21,000 cases were brought to light. As the epidemic began to spread children and parents started to avoid swimming pools, movie theatres, and crowded places where they or their child could be exposed to the virus.

In 1955 the vaccine came out and people were joyus. They even started calling it a miracle of the 20th century.