Both vibrio cholerae and salmonella typhi are capable of causing disease inside of otherwise healthy individuals. the id50 of v. cholerae is 1,000,000 cells, while the id50 of s. typhi is 10,000 cells. based on this information, which of the following statements is true?
a. both v. cholerae and s. typhi are pathogenic, but v. cholerae is more virulent than s. typhi.
b. both v. cholerae and s. typhi are pathogenic, but s. typhi is more virulent than v. cholerae.
c. s. typhi is pathogenic, while v. cholerae is non-pathogenic.
d. v. cholerae is pathogenic, while s. typhi is non-pathogenic.
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