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Middle Age Europe's Pandemics

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Middle Age Europe's pandemics

In terms of disease, the Middle Ages can be regarded as beginning with


the plague of 542 and ending with the Black Death (bubonic plague) of
1348. Diseases in epidemic proportions included leprosy, bubonic
plague, smallpox, tuberculosis, scabies, erysipelas, anthrax,
trachoma, sweating sickness, and dancing mania.

Leper:
 leper is as much an icon of medieval art as the crown or the cross.
Leprosy was so common in Europe during the Middle Ages that it's
estimated 1 in 30 people was infected with the bacteria. But by the
turn of the 16th century, after the Crusades had swept across Europe,
the disease mysteriously disappeared. And it never returned.

A study published in Science Thursday shows that the ancient leprosy


genome is nearly identical to the genome of modern-day leprosy.
Extracting a pathogen's DNA from human skeletons is nearly
impossible, says microbiologist Stewart Cole of the Ecole Polytechnique
Fédérale de Lausanne. "The material was a mixture of human DNA,
microorganisms and contaminating DNA from other bones and
surrounding soil," he says.

Bubonic plague (Blak Death):


The Black Death was a devastating global epidemic of bubonic
plague that struck Europe and Asia in the mid-1300s. The plague
arrived in Europe in October 1347, when 12 ships from the Black
Sea docked at the Sicilian port of Messina. People gathered on
the docks were met with a horrifying surprise: Most sailors
aboard the ships were dead, and those still alive were gravely ill
and covered in black boils that oozed blood and pus. Sicilian
authorities hastily ordered the fleet of “death ships” out of the
harbor, but it was too late: Over the next five years, the Black
Death would kill more than 20 million people in Europe—almost
one-third of the continent’s population.
The plague is thought to have originated in Asia over 2,000 years
ago and was likely spread by trading ships, though
recent research has indicated the pathogen responsible for the
Black Death may have existed in Europe as early as 3000 B.C.

Today, scientists understand that the Black Death, now known as


the plague, is spread by a bacillus called Yersinia  pestis. (The
French biologist Alexandre Yersin discovered this germ at the end
of the 19th century.)

They know that the bacillus travels from person to


person through the air, as well as through the bite of infected
fleas and rats. Both of these pests could be found almost
everywhere in medieval Europe, but they were particularly at
home aboard ships of all kinds—which is how the deadly plague
made its way through one European port city after another.

Smallpox:
Historians believe that smallpox appeared around 10,000 B.C. during
the first agricultural settlements in northeastern Africa. From there it
spread to India by means of ancient Egyptian merchants. Furthermore,
observations of typical skin rashes on Egyptian mummies dating from
1100 to 1580 B.C. give credence to theories that ancient Egypt was an
early region with endemic smallpox.

Unambiguous descriptions of the disease were documented in 4th-


century China, 7th-century India, and the Mediterranean region, as well
as 10th-century southwestern Asia. It is estimated that smallpox was
introduced to Europe between the 5th and 7th centuries, with frequent
epidemics during the Middle Ages.

The disease was generally confined to the Eurasian landmass before the
15th century; however, European colonists introduced smallpox to the
Americas (but also Africa and Australia) between the 15th and 18th
centuries with devastating case-fatality rates that approached 90%. It is
generally believed that this was instrumental in the fall of the empires
of the Aztecs and the Incas.

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