What?• The Black Death

was one of the worst natural disasters in the history. In 1347 A.D., an outbreak causing widespread hysteria and death. The bubonic plague mainly affected rodents, but fleas can transmit the disease to people.

• An infectious disease that is caused by the bacterium Yersinia pestis and is transmitted to humans from infected rats by the oriental rat flea is known as the Bubonic Plague or the Black Death.

Three Forms: The Bubonic, Pneumonic, and Septicemic. Each killed people in different

waysBUBONIC PHASE

• Most Common• Egg-sized swellings

(buboes)• Neck, armpits, groin (dark

blisters)• Headaches, Weakness,

Nausea/Vomiting• Severe Fever and Delirium

• The Pneumonic Plague was the second most commonly seen form of the Black Death.

• The Mortality rate: 90-95% (Today if Treated 5-10%) It infected the lungs, and the symptoms included slimy snot tinted with blood! Many times victims choked on their own Blood.

• The Septicemic Plague was the most rare form of all!

• The Mortality rate was close to 100%(Even today there is no treatment)

• Symptoms: High Fever and skin turning deep shades of

purple! Victims usually died the same day the symptoms appeared.

WARNING: GRAPHIC CONTENT

The content on the next slide is very graphic and may not be suitable for children under the age of 16.

The Symptoms

Bulbous (a inflammatory swelling of a lymph node.)

Septicemic Form:

almost 100% mortality rate.

So Who Was The Culprit?

No, Not Her!!!

The CulpritsYersinia Pestis

The Black Rat

The Oriental Rat Flea

The Disease

CycleFlea drinks rat blood

that carries the bacteria.

Flea’s gut cloggedwith bacteria.

Bacteriamultiply inflea’s gut.

Flea bites human and regurgitates blood into human wound.

Human is infected!

• Fleas, which live on the rats for food, abandon the rat when the rat dies.

• If these fleas then find a human the, Yersinia pestis is injected into the bloodstream.

• Then the disease can spread from man to man.

Plague Reaches

Ever heard the common nursery rhyme?

Ring a-round the rosy, Pocket full of posies, Ashes, Ashes! They all fall down! Well, the meaning is

almost as simple as the song and makes sense if you think twice about the song.• Ring around the rosy:

rosary beads give you Gods help.

• A pocket full of posies: used to stop the odor of rotting bodies which was a one point thought to cause the plague,

it was also widely used by doctors to protect them from the infect plague patients.• Ashes, ashes: the

church burned the dead when burying them became too difficult.

• We all fall down: dead

The Effects 1/3 of the population of Europe died. In total, 2.5 million people died from

the plague.

*Pop Quiz*What were the causes of the Black

death?A.) Dogs, Rats, CatsB.) Lions, Tigers, BearsC.) Yersinia Pestis, Fleas, RodentsD.) Yersinia Pestis, Bugs, Mosquitoes

B.) Yersinia Pestis, Fleas, Rodents