Tuberculosis is considered to be an infectious disease that affects the lungs. Globally, tuberculosis is the second biggest killer that is caused by one infectious agent. During the 18th & 19th centuries, North America and Europe were hit by the tuberculosis epidemic. In the year 1882, Robert Koch, a German microbiologist, was able to figure out the microbial causes behind this deadly disease. Following the discovery, effective drug treatment and vaccinations were developed to defeat the disease. The United Nations also predicted that tuberculosis (TB) would be eliminated entirely all across the globe by the year 2025. However, during the 1980s, the number of cases suffering from TB began to rise to a level where the World Health Organization (WHO), in the year 1993, announced that TB is a global threat. Because of this reason, the United States does a thorough screening test for tuberculosis to keep the disease out of the country. If you are applying f...