21. Sereny test is used for the detection of

A. enteropathogenic Escherichia coli
B. enterotoxigenic E. coli
C. enteroinvasive E. coli
D. verotoxigenic E. coli

22. Prodigiosin (red pigment) is produced by members of genus

A. Hafnia
B. Enterobacter
C. Serratia
D. Citrobacter

23. Which of the following serotypes of Salmonella can cause gastroenteritis?

A. S enteritidis
B. S Newport
C. S Typhimurium
D. All of these

24. Sylvatic plague occurs in

A. mice
B. squirrels
C. chipmunks
D. all of these

25. Verotoxin 1 of Escherichia coli is similar to

A. cholera toxin
B. Shiga toxin
C. heat-stable enterotoxin of E. coli
D. heat-labile enterotoxin of E. coli