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, ...

When reviewing a case to evaluate the validity of a gram-negative pneumonia diagnosis, look for several indicators. A version of this article was first published February 1, 2021, by HCPro's Revenue ...

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 ...