Which of the following is correct about Salmonella and Shigella?

Which of the following is correct about Salmonella and Shigella? 



a. They both produce shiga tox.
b. They are Gram-positive rods.
c. They are resistant to the gastric acid kill.
d. They cause typhoid fever.
e. They are facultative intracellular pathogen


Answer: They are facultative intracellular pathogen


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