Staphylococcus Test PDF

# Mcqs 1. The cause of *Staphylococcus epidermidis* infections is often related to: a) Bacteremia due to cannula infection b) Food poisoning c) Superficial skin inflammation d) Respiratory tract infections 2. Patients most at risk of *Staphylococcus epidermidis* infections are:...

# Mcqs 1. The cause of *Staphylococcus epidermidis* infections is often related to: a) Bacteremia due to cannula infection b) Food poisoning c) Superficial skin inflammation d) Respiratory tract infections 2. Patients most at risk of *Staphylococcus epidermidis* infections are: a) Children b) Immunocompromised individuals c) Athletes d) Pregnant women 3. *S. saprophyticus* is naturally found in: a) The nervous system b) The respiratory system c) The genitourinary tract d) The digestive system 4. Urinary tract infections caused by *S. saprophyticus* commonly occur in: a) Older women b) Young sexually active women c) Elderly men d) Children 5. The ability of *S. saprophyticus* to cause urinary tract infections depends on: a) Antibiotic resistance b) Its ability to adhere to uroepithelial cells c) Causing food poisoning d) Producing skin toxins 6. What is the result of the phosphatase test for *Staphylococcus epidermidis*? A. Colonies become pink B. Colonies remain colorless C. Colonies become yellow D. Colonies become black 7. What color indicates the presence of phenolphthalein in the phosphates test? A. Yellow B. Pink C. Green D. Blue 8. What is the result for *Staphylococcus epidermidis* in the novobiocin sensitivity test? A. Sensitive with a zone of inhibition B. Resistant with no zone of inhibition C. No growth on the agar D. Colonies turn pink 9. Which of the following shows a zone of inhibition in the novobiocin sensitivity test? A. *Staphylococcus aureus* and *Staphylococcus saprophyticus* B. *Staphylococcus epidermidis* and *Staphylococcus saprophyticus* C. *Staphylococcus aureus* and *Staphylococcus epidermidis* D. None of the above 10. What indicates that the bacteria are sensitive to a phage? A. Colonies turn pink B. Bacterial lysis occurs, creating a clear area on the agar C. Colonies become larger D. A zone of inhibition forms # Answer the question: - 1. What is the role of enzymes like lipase in the pathogenicity of *Staphylococcus aureus*? 2. How does toxic shock syndrome toxin-1 (TSST-1) function as a virulence factor in *Staphylococcus aureus* infections? 3. What does folliculitis caused by *Staphylococcus aureus* look like, and how does it affect the skin? 4. How do furuncles and carbuncles differ in appearance and severity? 5. What are the clinical features of Staphylococcus aureus-related toxic shock syndrome, and how does it manifest on the skin? 6. What are the key distinguishing characteristics of the *Staphylococcus* genus, and how do different species within this genus contribute to human infections? 7. What are the general characteristics of *Staphylococcus* species, including their morphology, oxygen requirements, and common pathogenicity factors? 8. What is the normal habitat of *Staphylococcus*? 9. How do the antigenic structures of *Staphylococcus aureus* differ from other *Staphylococcus* species? 10. What are the primary surface antigens found on *Staphylococcus* species? 11. What are the key virulence factors of *Staphylococcus aureus*, and how do they contribute to its ability to cause infections? 12. What is the preferred growth medium for culturing *Staphylococcus* species, and why is it chosen? 13. What is the significance of Mannitol Salt Agar (MSA) in the identification of *Staphylococcus aureus*? 15. How do you distinguish between *Staphylococcus aureus* and *Staphylococcus epidermidis* on a culture plate? 16. What is the role of a coagulase test in the identification of *Staphylococcus aureus*? 17. What temperature range is optimal for growing *Staphylococcus* species, and how does temperature influence their growth?