金黄色葡萄球菌(48hrs)染色结果 FIGURE 3. 8 A Gram stain of a 48-hour culture of Staphylococcus aureus. A 48-hour culture does not yield uniform results. Even though most cells are purple, a Gram-positive reaction, some cells are red, a Gram金黄色葡萄球菌(48hrs)染色结果