The Widal agglutination test is a blood test used to detect enteric fever, such as typhoid and paratyphoid fevers, caused by Salmonella bacteria. It works by detecting antibodies in a patient's serum that are produced in response to the bacteria's O (somatic) and H (flagellar) antigens. A positive result indicates a possible infection, though a blood culture is recommended to confirm a diagnosis, and the test is less effective for early-stage infections
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