The gut microbiome is more malleable in the first two years after birth, allowing probiotics to make their mark. Can we exploit this to improve infants’ health?

The microbial makeup of a newborn baby’s intestines has changed dramatically over the past 100 years, and we are now beginning to understand how and why this matters.

Most of the viruses present in people’s guts are bacteriophages, but how they interact with resident bacteria is still an open question.

Researchers find strains of the bacterium Klebsiella pneumoniae that produce high levels of alcohol in 60 percent of patients with the condition.

Research on hundreds of babies finds the delivery method is linked with a greater abundance of taxa more frequently seen in hospitals.

Physical activity, independent of diet, shifts the composition of bacteria in the intestines, spurring researchers to search for species that might provide benefits akin to working out.

An experiment delves into how the microbiome shapes immunity.

Molecules produced by resident bacteria and their hosts may signal immune cells to attack the body’s own tissues.

In a study of nearly 400 breastfeeding mothers, researchers find links between directly feeding the child and a more diverse microbiota, compared to milk from pumping.