We often hear about bacteria, but what exactly are they? A bacterium is a living organism that consists of a single cell (unicellular). It has ...

Gram staining is one way scientists can identify bacteria. Gram-positive bacteria, such as Staphylococcus, appear blue or purple under a microscope when scientists apply a stain. Conversely, ...

For years, conversations about vaginal health have been framed in simple, binary terms: there are “good” bacteria and there are “bad” bacteria. If the “good” bacteria dominate, you’re healthy. If they ...