产品介绍： Staphylococcus aureus is a Gram-positive coccal bacterium which is often found on the skin and in the human respiratory tract. It is positive for nitrate and catalase reduction. Staphylococcus aureus is not always pathogenic but it is a common cause of some skin infections, respiratory diseases and food poisoning. It often promotes infections by making potent protein toxins and expressing cell-surface proteins that bind and inactivate antibodies. The appearance of antibiotic-resistant forms of Staphylococcus aureus is a problem in medicine all over the world.