How did turburculosis start?

Tuberculosis (TB) is caused by the bacterium Mycobacterium tuberculosis, which is believed to have evolved from a similar bacterium that infected animals. It is thought that TB has existed for thousands of years, with evidence of the disease found in ancient human remains. The spread of TB became more pronounced with urbanization and population density, particularly during the 19th century, when conditions favoring transmission increased. Today, TB primarily spreads through airborne droplets when an infected person coughs or sneezes.