E. coli O157:H7 has a very low infectious dose because:

E. coli O157:H7 has a very low infectious dose because: 



a. it is encapsulated
b. disease results from a synergistic action with Shigella
c. it is resistant to the gastric acid kill
d. the intestine has many receptors for the toxin
e. it secretes a superantigen


Answer: it is resistant to the gastric acid kill


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