Biologists mapping the human microbiome expected to find new bacteria and viruses, not entities that slip through every familiar category of life. Yet that is what several research teams now say they ...

Researchers studying mouth bacteria say blocking the chemical signals microbes use to “communicate” could help prevent gum disease while preserving the healthy bacteria the body needs.

Kissing feels so tied to human life that it can seem almost impossible to separate from romance, family, grief, ritual, or ...

The human body has always been crowded with microscopic passengers, from bacteria to viruses and fungi. Over the past two years, however, researchers have started to realize that this familiar cast ...