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.
What did Marco Polo do? A: Marco Polo was a Venetian explorer and merchant who traveled extensively in Asia and recorded his experiences in a book. He was brought to China as a teena... Full Answer >