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But please keep in mind widal test should be done only after 7 days of fever. If done early it may give false negative results. If you have fever, get blood culture test done. Consult physician if you have any queries. There are no universal standards that define the cutoff dilution of agglutinating antibodies to indicate a positive Widal test. The very low specificity of the assay (50% to 70%) and the inability to discern active from previous infection or vaccination means that the assay should rarely, if ever, be used. The Widal test is a presumptive serological test for enteric fever or undulant fever whereby bacteria causing typhoid fever are mixed with serum containing s My, s widal report is positive, means.-You have typhoid if your widal is positive.

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Widal test positive values indicate that the person has the Salmonella enterica serovar typhi bacterial infection. In the typhoid report positive , both O and H antigen titres are present. S typhi O positive means active infection of typhoid fever. The Widal test may be falsely positive in patients who have had previous vaccination or infection with S. Typhi. Besides cross-reactivity with other Salmonella species, the test cannot distinguish between a current infection and a previous infection or vaccination against typhoid. The Widal test is a test procedure that involves mixing of the bacteria which cause typhoid fever to the blood consisting of certain antibodies taken from an infected person. It is an assumptive serological test used for undulant fever or enteric fever.

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S typhi O positive means active infection of typhoid fever. The Widal test may be falsely positive in patients who have had previous vaccination or infection with S. Typhi. Besides cross-reactivity with other Salmonella species, the test cannot distinguish between a current infection and a previous infection or vaccination against typhoid. The Widal test is a test procedure that involves mixing of the bacteria which cause typhoid fever to the blood consisting of certain antibodies taken from an infected person.

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It also appears that H titre is more useful than O titre. More false positives are found than false negatives.

The antibody titer is taken as the highest dilution of serum in which agglutination occurs. The type of agglutination seen with O reactions is granular while that seen with H reactions.
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Any reactive specimen with the Typhoid rapid test cassette needs to be confirmed with Widal test (also referred as Weil-Felix Test) is used to facilitate the diagnosis. It indicates a positive Test result for antibodies to S. typh The Widal test is positive if TO antigen titer is more than 1:160 in an active infection, or if TH antigen titer is more than 1:160 in past infection or in immunized   The Widal test was done by using the standard procedure (3). The Widal test was confirmed by the tube agglutination method and it was considered as positive  Study of the Usefulness of Widal Test in the Diagnosis of Typhoid Fever limit of the widal titer of normal person living in Chonnam area was 1 : 80 for S. typhi 0,  15 Jan 2018 Among the 824 febrile patients enrolled with positive serological test for and IgG ELISA and Widal test and for detection of S.typhi IgM antibodies the means of most primary health care facilities in the developing The O agglutinins are first to appear and H agglutinins appear later and last for a longer time than O agglutinins. Traditionally, a positive Widal test is based on a  Typhi Dot IgM in Mumbai · What is typhidot test?

Information and translations of widal's test in the most comprehensive dictionary definitions resource on the web. Widal's test: [vēdäls′] Etymology: Georges F. I. Widal, French physician, 1862-1929 an agglutination test used to aid in the diagnosis of Salmonella infections such as typhoid fever. This test measures the level of cold or febrile agglutinins in the blood that causes red blood cells to stick together at low or high temperatures. A fourfold positive predictive value and 95.8% negative predictive value. These results demonstrate that Widal test is not very reliable for diagnosis of typhoid fever since false positive and false negative results are common.
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O and H antigens are found. Widal test is a common agglutination test employed in the serological diagnosis of enteric fever. This test was developed by Georges Ferdinand Widal in 1896 and helps to detect presence of salmonella antibodies in a patient’s serum. Principle of Widal test Patients infected with Salmonella produce antibodies against the antigens of the organism. Widal test is an agglutination test in which specific typhoid fever antibodies are detected by mixing the patient’s serum with killed bacterial suspension of Salmonella. These bacteria suspension carry specific O, H, AH and BH antigens and after mixture, they are observed for clumping (antigen-antibody reaction). The Widal test is negative during the first week but still done to make a baseline of antibody titre.

There are many controversies regarding the Widal test especially involving the quality of the antigens used and interpretation of the result, particularly in endemic areas. Means no typhoid but it can't be rule out as false positive are more with widal test. Also co relate with clinical signs and symptoms.
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The Widal test is reported by giving the titer for both O and H antibodies. The antibody titer is taken as the highest dilution of serum in which agglutination occurs. The type of agglutination seen with O reactions is granular while that seen with H reactions. Both slide and tube tests are more easily read against a dark background.