A Gram stain is a test that checks for bacteria at the site of a suspected infection such as the

throat, lungs, genitals, or in skin wounds. Gram stains may also be used to check for bacteria

in certain body fluids, such as blood or urine. Gram-positive infections include methicillin-

resistant Staphylococcus aureus (MSRA), strep infections, and toxic shock.Gram-negative

infections include salmonella, pneumonia, urinary tract infections, and gonorrhea.