Microbiology All are true about widal test except A Base lines differ depending on the endemicity of the disease B O antibodies last longer and hence is not indicative of recent infection C H antigen cannot differentiate between subtypes D High titre value in a single widal test is not confirmative 💡 Explanation All are true about widal test except ✓ Correct Answer: B. O antibodies last longer and hence is not indicative of recent infection