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.
He was released in 1299, became a wealthy merchant, married, and had three children. He died in 1324 and was buried in the church of San Lorenzo in Venice. Marco Polo was not the first European to reach China (see Europeans in Medieval China), but he was the first to leave a detailed chronicle of his experience. This book inspired Christopher Columbus and many other travellers.