or gram-negative rods in a spun specimen of urine. Mycobacteria can be identified rapidly by microscopy of specimens stained with Ziehl-Neelsen, Kinyoun, or rhodamine auromine stains. Giardia ...

In 1884, a bacteriologist named Christian Gram created a test that could ... peptidoglycan layer on gram-negative bacilli. Gram-positive bacilli are shaped like rods. They can also be ...