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"Plague." World Health Organization. World Health Organization, n.d. Web. 02 Mar. 2017.

"The Plague / Black Death." The Plague / Black Death. N.p., n.d. Web. 02 Mar. 2017.

Welsh, Jennifer. "White Blood Cell Chases Down And Gobbles Up Bacteria [GIF]." Business Insider. Business Insider, 22 Feb. 2013. Web. 02 Mar. 2017.

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The Plague was highly contagious in the 13 & 14th Centuries. Now doctors know how to contain the disease so it won't spread  that frequently. It is less common.

The plague is caused by Bacteria and spreads by sneezing, and by touching other people, rodents (dead or alive).

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There is no cure currently to the Plague but there are some ways to contain it to a state that you can cure it a bit.

The Plague (in any form) requires urgent hospital treatment with strong antibiotics.

The Human that is infected with the plague has to be treated with a medical Professional.

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When the pestis attacks a cell, it uses the type-III pathway--a needle like projection to inject various toxins into the cell, killing it. This technique enabled us to identify the cell types targeted by the bacteria. Two days after the mice were infected, their spleens were filled with bacteria. T and B cells
make up what immunologists call the "innate" immune system. They are the first to respond to a bacterial invasion. Their role is to go to the infection site, engulf the bacteria, chew them up into smaller pieces and present those pieces to the T and B cells.

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The Immune system is the most effected by the Plague. The Plague attacks the Immune system by tearing down the cells called macrophages. Macrophages is a large cell that forms in the tissue like a mobile white cell.

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This is a picture of what the bacteria look like.

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The black death was first found in Asia. And then, mice / fleas came into europe and infected most people.

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It is very rare to get the plague now but It is very easily prevented. All you have to do is avoid rodents (mice and rats) and rodent droppings. Also, avoid insect bites by using an insect repellent containing DEET. Eliminate fleas from your home and avoid touching infected tissues, materials, or body fluids from a plague infected person or animal.

DEET is a insect repellent.

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There may only seem like there is one Type of Plague but there are actually multiple. There is the Bubonic plague, the Septicemic Plague and the Pneumonic Plague. These all had different affects on people.

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Cells make up tissues, tissues make up organs, organs make up organ systems, which make up a living organism.

Systems in the body include the immune system, respiratory system, digestive system, reproductive system, muscular system, skeletal system, circulatory system and nervous system.

All of the systems in the body are important and work together to help an organism survive.

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http://www.history.com/topics/black-death

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http://www.who.int/mediacentre/factsheets/fs267/en/
http://www.endocytosis.org/Black_Plague/
http://www.businessinsider.com/this-is-how-your-body-fights-off-bacteria-2013-2

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The way it spreads is that the yersinia pestis gets into your body and kills you. It all starts in rats. Then the fleas come in. They suck the blood from rats and  start to choke on the blood. This happens because the abdomen of the flea does not let the blood go down. Then the fleas go to the humans and bite them and suck their blood, but since the fleas were choking on the rat's blood, now they vomit the rat blood into the human and  the human is infected.
Now every time someone coughs or sneezes on someone who does not have the plague  that  human would die in a matter of days.  With every cough more and more people would start to die.

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In the 14th century, The Plague or also known as The Black Death, has killed about 75-200 million people in Europe and has killed almost 400 million people in total. Today there are 783 worldwide cases of The Plague and mostly found in Africa. There are 9 cases in the US right now.