A Widal test meaning is a serology blood test that helps detect typhoid or enteric fever in the body. This test was first conducted in 1896 by Georges Ferdinand Widal and was named after him. The Widal test is an advanced way to check for antibodies that your body makes against the salmonella bacteria that causes typhoid fever. It looks for O and H antibodies in a patient’s sample blood (serum). This test helps detect life-threatening illnesses like typhoid fever. However, interpreting the Widal