What is the Widal O 1:160&H:_1:320?

The usefulness of a single Widal test to diagnose typhoid fever in Ethiopia was investigated in three study groups both retrospectively and prospectively. These were blood culture proven typhoid and non-typhoid patients and healthy individuals. read more

The Widal test is positive. if “O” antigen titer is >1: 160 = active infection. If “H” antigen titer is >1: 160, indicate past infection or in immunized persons. A fourfold increase in the titer (e.g., from 1: 40 to 1: 160) is diagnostic. O antigen . In the acute stage, Antigen O will be positive and titer will be more than 1: 160. read more

The Widal Test detects the presence of serum antibodies (O and H) in patients with typhoid fever. The method relies on a reaction in a test tube or on a slide between antibodies present in the infected person's blood sample and specific antigens of S. typhi, which produces clumping that is visible to the naked eye. read more