New UCLA-led research suggests certain gut bacteria—including one that is essential for a healthy gut microbiome—differ between people who go on to acquire HIV infection compared to those who have not ...

With temperatures rising, people across the country are heading outdoors to garden, hike, swim and revel in the sunshine. But there's a hidden danger in the tall grass and brush—ticks carrying ...

Gram-positive bacteria show blue or purple after Gram-staining in a laboratory test. They have thick cell walls. Gram-negative bacteria show pink or red on staining and have thin walls. They release ...

Gram-negative meningitis is a form of meningitis. The term gram-negative refers to a way of differentiating bacteria. This type of bacteria is typically resistant to drugs and most available ...

There are many ways of classifying bacteria. One method is based on the cell membrane. In 1884, a bacteriologist named Christian Gram created a test that could determine if a bacterium had a thick, ...