In: Biology
1. Explain why methicillin-resistant S. aureus (MRSA) is a problem in clinical medicine.?
2. Do you see any nuclei in the specimens? What accounts for the colors of the cells? Explain.
1. S.aureus usually acts as a commensal of the human microbiota it can also become an opportunistic pathogen,being a common cause of skin infections including abscesses ,respiratory infections such as sinusitis and food poisioning .Pathogenic strains often promote infections by producing virulence factors such as potent protein toxins and the expression of cell surface protein that binds and inactivates antibodies.The emergence of antibiotic resistant strains of S.aureus such as methicilin-resistant S.aureus (MRSA) is a worldwide problem in clinical medicine.As 20% to 30% of human population are long term carriers of S.aureus .Despite much research and development ,no vaccine for S.aureus has been approved.
2.The most basic reasons that cells are stained is to enhance visualization of the cell or certain cellular components under a microscope .Cells may also be stained to highlight metabolic processes or to differentiate between live and dead cells in a sample.