6. Dysentery may be caused by

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

7. Which of the following(s) bacteria belong to the family Enterobacteriaceae?

A. Yersinia
B. Shigella
C. Salmonella
D. All of these

8. Transmission of bubonic plague is by

A. rat flea
B. inhalation
C. ingestion
D. all of these

9. The bacteria, which is more resistant to adverse environmental conditions, is

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

10. The reaction(s) that is/are usually positive in Escherichia coli, is/ are

A. Glucose fermentation
B. Indole reaction
C. Methyl red reaction
D. All of these