Gram staining is one way scientists can identify bacteria. Gram-positive bacteria, such as Staphylococcus, appear blue or purple under a microscope when scientists apply a stain. Conversely ...

Gram-positive bacteria show blue or purple after Gram-staining in a laboratory test ... This is due to their high resistance to antibiotics. Staphylococcus aureus does not normally cause infection ...

Gram-positive bacteria have thick cell walls. A Gram stain test, which involves a chemical dye, stains the bacterium’s cell wall purple. On the other hand, gram-negative bacteria stain pink instead.

Similar outcomes in patients with ventilator-associated pneumonia (VAP) suggest that antibiotics selected by Gram staining were ... both methicillin-resistant Staphylococcus aureus (MRSA) and ...

Staphylococcus saprophyticus ... by either E coli or S saprophyticus, there is also an increased likelihood of finding other organisms such as members of the gram-negative enteric species ...