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.
A map of Marco Polo's route to and from China. In the 13th century, a young Venetian named Marco Polo set out with his father and uncle on a great adventure. Following a series of trade routes, they traveled across the vast continent of Asia and became the first Europeans to visit the Chinese capital (modern Beijing).