Medicine Salmonella typhi is the causative agent of typhoid fever. What is the infective dose of S. typhi? A One bacillus B 10 8- 10 10 bacilli C 10 3-10 6 bacilli D 1-10 bacilli 💡 Explanation Salmonella typhi is the causative agent of typhoid fever. What is the infective dose of S. typhi? ✓ Correct Answer: C. 10 3-10 6 bacilli