If a typhoid fever outbreak has occurred, which of the following statements is true?
a. Proteus colonies of Enterobacteriales are probably present.
b. Shigella species are present and may have been transmitted by cattle.
c. Salmonella is present, and the serovars may be differentiated by antigenic analysis.
d. Escherichia coli bacteria are present, probably passed on by infected human waste in the water supply.
Answer: c. Salmonella is present, and the serovars may be differentiated by antigenic analysis.
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