5 Deadliest Diseases in Human History | #shorts #amazingfacts #ytshorts #diseases
5 Deadliest Diseases in Human History!
1. Bubonic Plague
The bubonic plague is a serious infectious disease that is caused by the bacillus Yersinia pestis. Also known as “The Black Death,” and “The Pestilence,” it has been around for centuries, with the very first instance being the Plague of Justinian that took place between 541–549 AD.
The Y. pestis bacteria spreads through infected fleas or small mammals, such as rodents, and is passed on to humans who are bitten or scratched. It is found all over the world, but since the bacteria was discovered in 1894, scientists soon developed ways of treating and preventing its spread, and it is now curable in most cases with things like antibiotics!
The Black Death (1346–1353) led to people developing public health measures like isolating sick people, quarantines, and doctors wearing protective clothing!
Luckily, we don’t hear about smallpox these days, as it has been completely eradicated due to vaccination. But once, it was one of the deadliest diseases to humans! It was caused by the Variola virus, and symptoms included fever, vomiting, skin rashes, and blisters.
While we don’t know where it originated from, and it has been around for centuries, the first widespread outbreaks took place in 18th century Europe.
Though people in ancient China and India tried to use some methods to inoculate against smallpox (like by rubbing infected scabs or fluid into scratches made on a healthy patient in the hopes of building immunity!) it was only in 1798 that Edward Jenner developed the first version of what we now call a vaccine.
Smallpox was spread between people or via contaminated objects (killing around 500 million people in just the 20th century alone), and the development of this smallpox vaccine really helped to fight the disease.
Influenza (also called the flu) is a highly contagious disease that attacks the respiratory system and is caused by a number of types of influenza viruses. While it’s possible that there have been influenza outbreaks since 6,000 BC, the first written record of an influenza epidemic, and the respiratory illness we know today, was in 1510.
While there are types of influenza that come from humans, influenza pandemics usually take place when a new strain of the virus is transmitted to humans from another animal species, especially animals that we eat (like pigs, chickens, or ducks).
Symptoms of the flu range from mild to severe and usually include fever, a runny nose, sore throat, muscle pain, headache, coughing, and tiredness.
4. Ebola Virus
Ebola Virus Disease (EVD) is a rare and deadly disease in people and nonhuman primates. The viruses that cause EVD are located mainly in sub-Saharan Africa. People can get EVD through direct contact with an infected animal (bat or nonhuman primate) or a sick or dead person infected with Ebola virus.
Also known as typhus fever, this disease is actually a group of infectious diseases that include epidemic typhus, scrub typhus, and murine typhus, all of which are caused by bacteria spread by lice, fleas, and mites. Its symptoms include fever, headache, and a rash.
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While it’s likely that typhus has been around for ages, the first described cases were in 1489 AD. However, there have been many outbreaks throughout history, usually starting in places with poor sanitary conditions and overcrowding. Luckily, it is now rare and can be treated with antibiotics like doxycycline.