Microbiology Salmonella typhi is the causative agent of typhoid fever. The infective does of S.typhi A One bacillus B 108-1010 bacilli C 102-105 bacilli D 1-10 bacilli 💡 Explanation Salmonella typhi is the causative agent of typhoid fever. The infective does of S.typhi ✓ Correct Answer: C. 102-105 bacilli