The results from two Phase 1 trials bolster the case that the gut microbiome plays a role in response to the drugs.

The newly discovered microbe seems to be responsible for a mysterious neurological disease that has killed dozens of critically endangered Western chimpanzees.

Bacteria-infecting viruses affect the composition and behavior of microbes in the mammalian gut—and perhaps influence human biology.

Phages interact with bacteria and eukaryotic cells in ways that researchers suspect influence mammalian health.

The mysterious DNA sequences appear to help bacterial cells spot when they’ve been infected with viruses—and prompt those cells to self-destruct.

Here’s our brief guide to the most noteworthy mutations in the novel coronavirus.

Scientists across the world are closely tracking the spread of mutations in the coronavirus and investigating whether they could render current vaccines less effective.

A preprint casts doubt on vaccine effectiveness in light of certain mutations in the 501Y.V2 variant that emerged from South Africa.

Host vouchering, the practice of preserving species known to harbor infectious diseases, can be used to help determine a pathogen’s source, scientists say.