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6. Dysentery may be caused by

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

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

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

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8. Transmission of bubonic plague is by

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

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

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

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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

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