The black death or bubonic plague was one of the deadliest viruses in the world it was formed in 1346 it killed over 3% of the eroupe or killed 200m people in the earth population. It was caused by marmots and other rodents It will give you an apple-sized nose bled in black blood and pain in the facial muscles but if it was now in 2021 it will not be that much of a problem as it can be cured with antibiotics so if it came now in 2021 but it's still quite scary because the reason it killed so many people then and lastly it was ended in 1350