Microbiology A man with very high fever shows strongly positive agglutination test with OXK antigen. The most likely diagnosis is- A Tsutsugamushi fever B Trench fever C Undulent fever D Relapsing fever 💡 Explanation A man with very high fever shows strongly positive agglutination test with OXK antigen. The most likely diagnosis is- ✓ Correct Answer: A. Tsutsugamushi fever