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11. An enrichment medium for the isolation of Shigella is

A. Alkaline peptone water
B. Terathionate broth
C. Selenite F broth
D. none of these

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12. In the Widal test, the significant titers for H agglutinins is

A. 1:50 or more
B. 1:100 ormore
C. 1:200 or more
D. 1:400 or more

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13. Heat-labile enterotoxin of Escherichia coli activates

A. guanylate cyclase
B. adenylate cyclase
C. both (a) and (b)
D. none of these

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14. Heat-stable enterotoxin of Escherichia coli activates

A. adenylate cyclase
B. guanylate cyclase
C. both of the above
D. none of these

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15. The bacteria that is negative for fermentation of mannitol is

A. S flexneri
B. S boydii
C. S dysenteriae
D. S sonnei

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