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The Conversation
Karen Dobos, Professor of Microbiology, Colorado State University

As tuberculosis cases rise in the US and worldwide, health officials puzzle over the resurgence of a disease once in decline

A microscopic view of _Mycobacterium tuberculosis_, the bacteria that causes tuberculosis. koto_feja/E+ via Getty Images

An outbreak of tuberculosis, or TB – a lung disease that is often accompanied by a hacking cough – began in January 2024 in Kansas City, Kansas, and two nearby counties and continues as of early March 2025. To date, 147 people have been reportedly diagnosed with TB in the outbreak, with 67 becoming ill. The remaining 80 people diagnosed with TB in Kansas contracted the illness but showed no symptoms, which is called a latent infection.

TB is the leading infectious cause of death around the world, outpaced only by COVID-19 during the first three years of the pandemic.

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