A study of Shuar children in Ecuador provides a window into how the human body responds to infection in the sorts of conditions that shaped our species’ evolution.

By combining two new microscopy technologies, researchers filmed immune cells toiling away in the inner ear of a living zebrafish.

When a mouse’s brain undergoes traumatic injury, immune cells clear the dead from the affected area, after which blood cells swoop in to repair blood vessels.

A preliminary clinical trial finds that the personalized therapy improves survival rates and has no severe side-effects.

Social insects kill infected individuals for the benefit of the colony—and now a study has shown how they know who’s sick.

Macrophages play numerous roles within tumors, leaving cancer researchers with a choice: eliminate the cells or recruit them.

A new study reveals that a constant stream of ink-gobbling immune cells helps hold tattoos in place.

Dampening the immune response to stay up in the air may have helped bats become tolerant to viral infections.

Signaling pathways triggered by the mother’s immune system may cause complications during fetal development.