Infantile diarrhea and traveller‘s diarrhea are commonly caused by
A. Escherichia coli
B. Treponema pallidum
Clostridium botulinum
D. Listeria monocytogenes
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E.coli cause disease by different ways. Which one of the following E.coli serotypes is characterized by the presence of ST (heat stable) and LT (heat liable) proteins?
A. Enteroinvasive E.coli (EIEC)
B. Enterotoxigenic E.coli (ETEC)
C. Enterohemorrhagic E.coli (EHEC)
D. Enteropathogenic E.coli (EPEC)
E. coli O157: H7 is a newsworthy microorganism that has been isolated from foods (meat) and beverages (cider) with increasing frequency. Which of the following statements best describes its characteristic biology?
A. It secretes erythrogenic toxin that causes the characteristic signs of scarlet fever.
B. It produces toxin that blocks protein synthesis in an infected cell and carries a lytic bacteriophage that produces the genetic information for toxin production.
C. It produces at least one protein toxin consisting of two subunits, A and B, which cause severe spasmodic cough usually in children.
D. It secretes exotoxin that has been called“verotoxin”and Shiga-like toxin”; infection is mediated by specific attachment to mucosal membranes.
Which of the following is most often associated with bacterial dysentery? ( )
A. Vibrio cholerae
B. Species of the genus Shigella
C. Salmonella enteriditis
D. Species of the genus Clostridium
In the laboratory diagnosis of the enteric pathogens Salmonella and Shigella, the screening procedure includes testing their inability to
A. ferment glucose
B. ferment lactose
C. ferment sucrose
D. produce oxidase
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