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er of tests performed in a given year.Until the 19th century, the factor causing epidemics was not known, and the escape from a place where it occurred as well as isolation of patients was considered to be the only effective way to avoid illness and death. Quarantine in a sense similar to modern times was used in 1377 in Ragusa, today's Dubrovnik, during the plague epidemic. It was the first administratively imposed procedure in the world's history. It was later used in Venice and other rich port cities in the Mediterranean. On the territory of today's Pola
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