Bacteria and viruses are often lumped together as germs, and they share many characteristics. They’re invisible to the human eye. They’re everywhere. And both can make us sick, even kill us. That last ...

Add Yahoo as a preferred source to see more of our stories on Google. The idea that a single-celled bacterium can defend itself against viruses in a similar way as the 1.8-trillion-cell human immune ...

Scientists generally agree that eukaryotes, the domain of life whose cells contain nuclei and that includes almost all multicellular organisms, originated from a process involving the symbiotic union ...

Scientists found an unexpected viral hitchhiker lurking inside a common gut bacterium – and it was twice as prevalent in people with colorectal cancer.

Researchers have discovered the first giant virus in Finland. The specimen demonstrates that such huge viruses are more common in northern regions than previously thought. Viruses are tiny. Even ...

Researchers uncover a notorious cholera strain that contains sophisticated immune systems to fend off viruses, which potentially helped it to fuel a devastating epidemic across Latin America. When we ...