Which of the following statements about the Widal test is INCORRECT?

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Baseline titers vary according to the disease's endemic region.O antibodies persist for a longer duration, making them unreliable for detecting recent infections.The H antigen does not allow distinction between different subtypes.A single high titer result in the Widal test is not definitive for diagnosis.

Explanation

Statements A, C, and D accurately describe the Widal test. Statement B is incorrect because O antibodies typically indicate recent infection due to their shorter persistence, unlike H antibodies which last longer.