Microbiology A 24 year-old cook in a hostel mess suffered from enteric fever 2 years back. The chronic carrier state in this patient can be diagnosed by – A Vi agglutination test. B Blood Culture in Brain Heart infusion broth. C Widal test D All of the above 💡 Explanation A 24 year-old cook in a hostel mess suffered from enteric fever 2 years back. The chronic carrier state in this patient can be diagnosed by - ✓ Correct Answer: A. Vi agglutination test.