Research traces the evolution of a gene variant that reduces the risk of Alzheimer’s disease, finding that it originally evolved in response to infectious bacteria.

Stressed cells can form hollow actin bridges to neighbors to get help, but the virus may hijack these tiny tunnels for its own purposes, a study suggests.

IgA antibodies appear to bind to specific species of commensal gut bacteria in mice, according to a study.

The marine animals have evolved a unique molecular pathway enabling them to use toxins to fight off invaders without poisoning themselves in the process.

Researchers are going beyond fecal samples to understand how the patterns of commensal microbes in the gastrointestinal tract influence development and health.

The Scientist spoke with Brigham and Women’s Hospital and Harvard Medical School researchers Scott Weiss and Yang-Yu Liu, who propose that people bank stool samples when they’re young and healthy so that they can be transplanted to rejuvenate the gut microbiome later on.

At about 2 centimeters in length, Thiomargarita magnifica tests scientists’ notions of how large microbes can grow.

Health data from 5,744 adults over the age of 50 reveals an association between stressors such as discrimination and a relatively small proportion of younger infection-fighting immune cells.

A study reveals a molecular pathway linking exercise to an amped-up immune response to pancreatic cancer and greater responsiveness to treatment.

How scientists aim to induce an immune response against addictive drugs

Researchers are turning to the immune system for help in treating addiction and preventing overdose.

Dozens of intranasally delivered vaccines targeting SARS-CoV-2 are in development. Could they pave the way for widespread nasal vaccination in the future?

Two strains of monkeypox have been detected in the US, suggesting the virus has been circulating in the country for some time, the CDC says.