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