Pepperall Tuberculosis Map (IMAGE) University of Wisconsin-Madison Caption Map shows movement of two subtypes of the tuberculosis bacterium lineage 4 after `it was introduced, presumably by infected sailors. Today, lineage 4 causes 17 percent of China's tuberculosis cases. Credit Pepperell, <em>et al</em>.,<em> Nature Ecology & Evolution</em> Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.