Over 100 years since its introduction as a serologic means of detecting the presence of typhoid fever, the Widal test continues to be plagued with controversies involving the quality of the antigens used and interpretation of the result, particularly in endemic areas. INTRODUCTION OF WIDAL TEST Widal test is a serological test that is done for the diagnosis of typhoid fever caused by Salmonella organism. This test detects the “O” and “H” antigen of Salmonella typhi and paratyphi A,B and C. When facilities for culturing are not available, the Widal test is the reliable and can be of value in the diagnosis of typhoid fevers in endemic areas. Its the name of blood test and it is named after the person who has first started the test with reagents for recognising d germs causing Typhoid.

S widal test

Widal test is an agglutination test which detects the presence of antibodies in patient’s serum produced against the causative agents of enteric fever (Salmonella Typhi and Salmonella Paratyphi A, B and C). It is one of the common methods employed for serological diagnosis of typhoid and paratyphoid fever especially in the endemic regions. The Widal test is one method that may be used to help make a presumptive diagnosis of enteric fever, also known as typhoid fever. Although the test is no longer commonly performed in the United States or other developed countries, it is still in use in many emerging nations where enteric fever is endemic and limited resources require the use of rapid, affordable testing alternatives. Widal Test Widal test is used for the diagnosis of enteric fever.

It measures agglutinating antibody levels against O and H antigens. serological test for enteric fever.

The Widal test has been in use for more than a century as an aid in the diagnosis of typhoid fever. It measures agglutinating antibody levels against O and H antigens. The Widal test is positive after the tenth day of the disease and may be false positive if an individual previously received a TAB vaccine. The Widal test measures the capacity of antibodies against LPS and flagella in the serum of individuals with suspected typhoid fever to agglutinate cells of S. Typhi; the test was introduced over a century ago and it is still widely used. It is simple, inexpensive, and takes only a few minutes. Widal test means to detect typhoid causing bacteria in the bloodstream of the patient through the agglutination biochemical test.

This test was developed by Georges Ferdinand Widal in 1896 and helps to detect presence of salmonella antibodies in a patient’s serum.
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2012-02-01 · The recommended method of performing the widal test is by the tube agglutination technique were serial two-fold dilutions of the subject’s serum from 1:20 to 1:1280 are tested[6]. Now a days a rapid slide test is most commonly used technique in local laboratories and hospitals because of its convenience.

The bacterium is spread due to intake of food or water contaminated with the faeces of an infected person (poor hygienic conditions). Widal test interpretation . The antibodies develop at the end of the first week and the titres rise during 2 nd, 3 rd and 4 th week, after which they slowly decrease. Hence a Widal test performed early in the first week may give negative results.
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In addition, Widal The Widal test is also prone to false negative values.

A fourfold Widal test synonyms, Widal test pronunciation, Widal test translation, English dictionary definition of Widal test. n. A test of blood serum that uses an agglutination reaction to diagnose typhoid fever. Definition of Widal's test in the Legal Dictionary - by Free online English dictionary and encyclopedia.

Widal test is an agglutination test employed in the serological diagnosis of enteric fever.