A team of researchers at the University of California, Los Angeles (UCLA) has introduced a virtual Gram staining technique that could transform how microbiologists stain and classify bacteria.

But what are the differences between gram-positive and gram-negative bacteria? The names themselves date back to 1884, when Danish bacteriologist Hans Christian Gram developed a staining procedure ...

Gram-negative bacteria show pink or red on staining and have thin walls. They release different toxins and affect the body in different ways. Gram-positive and Gram-negative are types of bacteria.