The world’s deadliest infectious disease is on the rise in the US

Various types of bacteria, 1889. | Oxford Science Archive/Print Collector/Getty Images

Something unusual happened at Archbishop Riordan High School last fall. 

In September, a student in the Bay Area school went to see a health care provider for a cough that wouldn’t go away. But it wasn’t until two months later that the student got diagnosed: tuberculosis. The San Francisco Department of Public Health (SFDPH) launched an investigation, which revealed a surprisingly high rate of latent tuberculosis ...