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.
In 1260, two Venetian merchants â Nikkolo and Maffeo (the father and uncle of Marco Polo) left for the East taking the ânorthern wayâ. This caravan journey lasted for a whole year, and finished in the residence of great Kublai Khan.