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New Study Says Human Parasites, Not Rats, Spread The Bubonic Plague

Rats suffered a bad rap on the spread of the Black Death plaque, not until now.

Angela Beltran





The Black Death plague that came to Europe in the 14th century erased 60 percent of the population. The pandemic, which was considered one of the worst in human history, took the lives of tens of millions of people during outbreaks that occurred for 500 years.

The classic explanation says it was caused by the bacteria called Yersinia pestis, which made rats, gerbils or other rodents their hosts. The bacteria thrived on rodents and fleas bit them. They then jumped unto humans and feasted on their victims.

Rats suffered a bad rap for spreading the Black Death that wiped out a third of the European population.

Source: Pixabay

For a very long time, rats had a bad reputation for spreading the plague. However, it turns out that rats or rodents might not be blamed after all. Rather, the bacteria may have spread from person to person. Scientists suggest that the transmission was caused by human-feeding parasites like lice and fleas.

Katherine Dean, the lead author of the study, said:

“The plague really transformed human history, so it’s really important to understand how it was spreading and why it was spreading so fast.”

In the study published in the journal Proceedings of the National Academy of Sciences, the bacteria was carried by human parasites instead of fleas found on rodents.

The deadly bite

In the past, it was thought that rodents are responsible for the spread of the deadly bacteria. When infected fleas from rats bite humans, the bacteria can readily enter the bloodstream and infect the victim’s lymph nodes, which are found all over the body.

The mode of transmission originally explained may not have been the same for each outbreak of the plague. For instance, in earlier outbreaks, the human deaths are not accompanied by rat deaths, which is termed as “rat falls”. However, for later outbreaks such as the Third Pandemic, humans, and rats deaths were rampant. This hints that maybe rats were not that responsible for the earlier outbreaks.

The researchers simulated Black Death outbreaks

The researchers, to land at an answer to the longstanding query, simulated Black Death outbreaks in the cities of Europe to understand how the plaque was spread.

The University of Oslo scientists modeled the three routes of transmission for the illness – rats, human fleas and lice and airborne. The team utilized mortality data for all nine outbreaks that happened during the second pandemic.

Human ectoparasites like lice and fleas are most likely the cause of the vast spread of the disease.

Source: Pixabay

Based on their findings, human ectoparasites like fleas and lice showed the death or mortality trends more accurately.

Professor Nils Stenseth, from the University of Oslo, said in a statement:

“The conclusion was very clear. The lice model fits best.”

“It would be unlikely to spread as fast as it did if it was transmitted by rats.”

“It would have to go through this extra loop of the rats, rather than being spread from person to person.”

The study will open the doors to more research about the plagues that took the lives of the people back then, and until now. In 2017, the World Health Organization (WHO) reported that a total of 2,348 confirmed, probable and suspected cases of plague were recorded in Madagascar, with 202 deaths.


10 Strange Cases of People Who Rose From the Dead

Being buried alive is probably the worst thing that could ever happen to you.




History is rich with stories about dead people who awoke in their coffins. Take for example Margorie McCall, who, according to an Irish Legend, was called the Lady with the Ring. He reportedly died of fever in 1705 and was quickly buried six feet under, as people wanted to prevent her sickness from spreading. But on the evening of her burial, some snatchers dug her up, hoping to steal her expensive ring and sell her body.

Apparently, Margorie woke up and let out a loud scream as one of the snatchers tried to cut her finger off. One account suggests that the shocked robbers died on the very spot she was buried, though some say that they fled and never raided another dead body again.

Well here are 10 more stories of people who, in some ways, found a way to rise from the dead.

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The Sad Story of the Filipino Slave Known As The “Painted Prince”

In the late 1600s, an unfortunate Filipino slave with intricate tattoos was brought to England and became known as the “Painted Prince.”

Faye Williams



In the late 1600s, a Filipino slave caused quite a sensation when he arrived in England. The Filipino was given the name "Prince Giolo." People also called him the "Painted Prince" because his body was adorned with intricate tattoos. However, the man didn't exactly live like royalty. In fact, he was treated like a freak and dismissed as a savage.

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5 Vintage Illustrations of the Future That Have Become a Reality

The future is now.




Humans have never been content of just living in the present. We have this incessant need to know what will happen in the future. Why do you think Nostradamus got really famous?

Predictions about the future come in different forms, just like this vintage cartoon illustrations here. These predictions go waaay back, as old as the 1800s or early 1900s. Back then, these illustrations may have looked silly to downright ridiculous, but looking at them right now, they are totally on point!

#1. TV glasses

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