Tuberculosis Bacteria's Stealth Trick to Evade Immunity

Scientists uncover how TB bacteria hijack immune cells to survive

Published on Feb. 22, 2026

Got story updates? Submit your updates here. ›

Researchers have discovered that tuberculosis-causing bacteria release tiny packages called extracellular vesicles that fuse with the membranes of immune cells, stiffening the cell membrane and preventing the immune cells from destroying the bacteria. This biophysical trick allows the TB bacteria to hide from the body's defenses, contributing to the disease's continued global impact.

Why it matters

Tuberculosis remains a major public health crisis, particularly in developing regions, killing over 1 million people annually. Understanding the sophisticated mechanisms TB bacteria use to evade the immune system is crucial for developing new treatment strategies to combat this deadly infectious disease.

The details

The researchers found that the TB bacteria's extracellular vesicles contain specialized lipids that make the immune cell membrane more rigid. This prevents the phagosome, which traps the bacteria, from fusing with the lysosome that would normally destroy the bacteria. The researchers observed similar membrane-stiffening effects from other pathogens like Klebsiella and Staphylococcus, suggesting an evolutionarily conserved evasion tactic.

  • The research will be presented at the 70th Biophysical Society Annual Meeting in San Francisco from February 21–25, 2026.
  • The findings were recently posted on the preprint server bioRxiv.

The players

Ayush Panda

Formerly a graduate student in the laboratory of Mohammed Saleem at the National Institute of Science Education and Research, India, who was drawn to this research due to the impact of tuberculosis outbreaks in his home state.

Mohammed Saleem

Researcher at the National Institute of Science Education and Research, India, who supervised the tuberculosis research.

Got photos? Submit your photos here. ›

What they’re saying

“Tuberculosis is rampant in India. I grew up in a state where tuberculosis outbreaks are a major problem, and I was always curious about how these diseases spread. That's what drew me to this research.”

— Ayush Panda, Former graduate student (Mirage News)

“If the membrane becomes more rigid, it becomes much harder for the phagosome to fuse with the lysosome. It's an elegant biophysical mechanism: the bacteria remodel the membrane architecture to escape the very process that would have killed them.”

— Ayush Panda, Former graduate student (Mirage News)

“The most surprising finding was when we introduced mycobacterial lipids into membranes that mimic the host phagosome, we saw remarkable physical changes—the membrane properties were completely altered.”

— Ayush Panda, Former graduate student (Mirage News)

What’s next

The researchers plan to explore ways to target the proteins involved in the production of these bacterial vesicles or find methods to counteract the membrane-stiffening effects, in order to develop new treatments that could help the immune system destroy tuberculosis bacteria.

The takeaway

This discovery of how tuberculosis bacteria hijack immune cells by stiffening their membranes represents a significant advance in understanding the sophisticated mechanisms pathogens use to evade the body's defenses. By uncovering this biophysical trick, researchers can now pursue new strategies to stop these deadly infections and combat the global tuberculosis crisis.