Although only about one person in ten with a positive skin test or blood assay ever develops. TB disease, the risk continues throughout the rest of your life. The symptoms of TB are. common to many other illnesses.
Marco Polo-Great Silk Road. For many centuries the Great Silk Road connected a complex network of trade routes from Europe with Asia. It was a way to establish contact with the great civilizations of China, India, the Near East and Europe.
1 It was over 4,000 miles long. 2  Marco Polo traveled to China along the Silk Road. 3  Not all that was traded along the Silk Road was good. 4  It is thought that the bubonic plague, or Black Death, traveled to Europe from the Silk Road.