Staphylococcus ... On an agar slant or broth culture of the bacteria several drops of 3% hydrogen peroxide are applied. Catalase-positive cultures bubble at once. This cannot be done on blood ...

Staphylococcus aureus can infect ... aureus, the medium used is suffused with blood and lactose. Also commonly used is the mannitol salt agar, which is a selective medium with 7–9% salt or ...