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.
How old was Marco polo when he traveled? Marco polo was seventeen years old when he left Venice with his father and uncle to Cathay, or modern day China.ow old was Marco polo when he traveled? Marco polo was seventeen years old when he left Venice with his father and uncle to Cathay, or modern day China.