8. Staphylococcal food poisoning usually manifests itself following ingestion of contaminated food after
A.2-6 hours
B.8-12 hours
C.12-18 hours
D.18-36 hours

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9. Which of the following Staphylococcal haemolysins does not cause lysis of human RBCs?
A.β haemolysin
B.γ haemolysin
C.α haemolysin
D.δ haemolysin

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10. The toxin of Staphylococcus aureus that may result into scalded skin syndrome is
A.Enterotoxin
B.Leucocidin
C.Epidermolytic toxin
D.Haemolysin

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11. The bacteria which can ferment mannitol anaerobically is
A.Staphylococcus aureus
B.S epidermidis
C.S saprophyticus
D.None of these

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12. Protein A is found in cell wall of
A.coagulase-negative staphylococci
B.Staphylococcus aureus
C.Micrococci
D.none of these

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13. The most common cause of cystitis (after Escherichia coli) in healthy sexually active women is
A.Staphylococcus saprophyticus
B.Proteus mirabilis
C.Pseudomonas aeruginosa
D.Klebsiella pneumoniae

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14. Which of the following can be used to detect clumping factor?
A.tube coagulase test
B.slide coagulase test
C.precipitation test
D.none of these

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