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Virus:
-Is a small infectious agent that replicates only inside the living cells of other organisms.
-Caused by viruses are the common cold, influenza e cold sores.
- More serious diseases like Ebola and AIDS are also caused by viruses.Today effective way to combat viruses is trough vaccinations.
Bacteria :were among the first life on the earth.They can sometimes form a parasitic and with other other organisms and become pathogens,they can cause infection such as tetanus,typhoid,syphilis,cholera,leprosy and tuberculosis,the bacteria infections may be treated with antibiotics.

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Bubonic plague: is an infection which effects the lymph glands. It is caused by bacteria infection with yersina pesties.
It is carried by fleas and rodents.
The bubonic plague kills within four days.
Pneumatic  plague: is caused the same bacteria as bubonic plague and is characterised by sneezes and coughs,as the bacteria become airborne. Pneumatic plague  infects the respiratory system.

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The library was built in the 1609 by Cardinal Federico Borromeo.
Alessandro Manzoni wrote about the plague in his book The Betrothead (1827).
He didn’t live in the time of plague, so, he his based descriptions on books and documents such Giuseppe Ripamonti’s (was a librarian and curator who worked in his library) “De peste quae fuit”.
Also Bocaccio wrote about the Blach Death in Florence.

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This church is dedicated to St Sebastian expresses the gratitude of the city to St Sebastian during the terrible plague.The church was built by the citizens of Milan in order to thank God because they survived the plague. We can see many symbols how the  connection of the martyr shot with arrows with the plague with the Greco-Roman myth, Apollo, the archer God and we can see shields of the districts of Milan indeed there are many believes and superstitions about this theme and then this believes that the Devil or the witches caused the plague.

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The origins of the church and the ossuary date back to the thirteenth century. The walls are almost entirely covered with skulls and bones. They are believed to be the remains of the deceased from the Brolo hospital, from the corpses taken from the seventeenth-century cemeteries

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It is a very old christian church.
At the time, every Sunday, te Archbishop Carlo Borromeo celebrated the mess.
In Milan, in 1630, Guglielmo Piazza was accused of spreading the plague with a unguent. He said that the barber Mora gave to him the unguent.
The two man were imprisoned and tortured and executed.
In the place of execution was built infamous column to remember the ignorance of that period.

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It was strongly wanted by Francesco Sforza, Duke of Milan, in 1456.
Then they realized that the hospital was too small because the disease killed many people every year. As a consequence they built the famous Lazzaretto outside Milan (a bigger hospital).Now,people think that the plague doesn’t exist in the present. In reality the disease still kills many people every year (for example in Congo, Africa) and bacteria constantly evolve.Nowadays there are many medicines and remedies to recover from the plague, for example antibiotics (penicillin).