Widal test


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Widal test

 [ve-dahl´]
a test for the diagnosis of typhoid fever, based on agglutination of Salmonella typhosa by dilutions of the patient's serum.

Widal test

(vē-däl′)
n.
A test of blood serum that uses an agglutination reaction to diagnose typhoid fever.

Widal reaction

, Widal test (vē-dal′)
[Georges Fernand Isidore Widal, Fr. physician, 1862–1929]
An agglutination test for typhoid fever.

Widal test

A serological agglutination reaction of Salmonella typhi and similar organisms by the patient's serum, used to diagnose typhoid and paratyphoid fevers. (George Fernand Isadore Widal, 1862–1929, Algerian born French pathologist).
References in periodicals archive ?
Out of 50 blood culture positive cases, Widal test ease positive in 26 and negative in 24 cases.
The widal test was positive in 06(37.50%) out of 16 blood culture positive cases and in 52(61.90%) out of 84 culture negative typhoid cases.
Serial (four) Widal tests done at 3 days' interval remained positive with a titre of <1/160 for both somatic and flagellar antibodies.
Widal test results from an acute phase serum sample should be interpreted based on the baseline titre prevalent in healthy individuals in that particular geographic area.
On diagnosis, 30 (83.4%) patients had positive Widal test, 6 (16.6%) patients positive blood cultures.
However, the test is much simpler than blood culture, typhidot M and Widal test. Thus, it can be used in resource poor settings and primary health centers.
Forty three out of 70 patients' serum samples sent for rapid screening Widal test were positive.
Rapid serologic diagnosis of pediatric typhoid fever in an endemic area: a prospective comparative evaluation of two dotenzyme immunoassays and the Widal test. The American Journal of Tropical Medicine and Hygiene 1999;61(4):654-7.
Rapid serological diagnosis of pediatric typoid fever in an endemic area: A prospective comparative evaluation of two dot-enzyme immunoassays and the Widal test. Am J Trop Med Hyg 1999; 61(4): 654-57.
A single positive Widal test is of limited value in endemic countries as the baseline titres cannot be established with adequate accuracy.12 Despite this, Widal, Typhidot and TUBEX(r) TF continue to be routinely employed in the diagnosis of enteric fever.13,14 Furthermore, these tests are also being utilized in conducting prevalence studies across the globe, particularly in developing countries, where inappropriate results can lead to wastage of resources.
The patient was further subjected to a full FUO workup, including blood tests for malarial antigen as well as parasite, Widal test, dengue serology, leptospira serology, scrub-typhus serology and RPR for syphilis.
Investigations included are complete hemogram, platelet count, blood culture, widal test, malaria-thick and thin smear, dengue-NS1 IC card, IgM ELISA, Leptospirosis--IgM ELISA, urine examination and USG abdomen.