Definitions for widal test
widal test

Princeton's WordNetRate this definition:2.3 / 3 votes

1. Widal test, Widal's testnoun

   a test for detecting typhoid fever and other salmonella infections

WiktionaryRate this definition:4.5 / 4 votes

1. Widal testnoun

   The agglutination test for typhoid fever.

WikipediaRate this definition:1.0 / 1 vote

1. Widal test

   In 1896 and named after its inventor, Georges-Fernand Widal, is a presumptive serological test for enteric fever or undulant fever whereby bacteria causing typhoid fever is mixed with a serum containing specific antibodies obtained from an infected individual. In cases of Salmonella infection, it is a demonstration of the presence of O-soma false-positive result. Test results need to be interpreted carefully to account for any history of enteric fever, typhoid vaccination, and the general level of antibodies in the populations in endemic areas of the world. Typhidot is the other test used to ascertain the diagnosis of typhoid fever. As with all serological tests, the rise in antibody levels needed to perform the diagnosis takes 7–14 days, which limits its applicability in early diagnosis. Other means of diagnosing Salmonella typhi (and paratyphi) include cultures of blood, urine and faeces. These organisms produce H2S from thiosulfate and can be identified easily on differential media such as bismuth sulfite agar. 2-mercaptoethanol is often added to the Widal test. This agent more easily denatures the IgM class of antibodies, so if a decrease in the titer is seen after using this agent, it means that the contribution of IgM has been removed leaving the IgG component. This differentiation of antibody classes is important as it allows for the distinction of a recent (IgM) from an old infection (IgG). 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 persons. A single Widal test is of little clinical relevance due to the high number of cross-reacting infections, including malaria. If no other tests (either bacteriologic culture or more specific serology) are available, a fourfold increase in the titer (e.g., from 1:40 to 1:640) in the course of the infection, or a conversion from an IgM reaction to an IgG reaction of at least the same titer, would be consistent with a typhoid infection. A new serological test called the Tubex test is neither superior nor better performing than the Widal test. Therefore, Tubex test is not recommended for diagnosis of typhoid fever.

ChatGPTRate this definition:0.0 / 0 votes

1. widal test

   The Widal test is a diagnostic test for enteric fever or undulant fever, especially typhoid fever, where serum agglutinins are looked for. It helps in detecting the presence of a specific type of bacteria called salmonella, which causes typhoid. The test is based on demonstrating the presence of antibodies (agglutinins) against O and H antigens of the bacteria in the blood serum of the infected patient.

WikidataRate this definition:4.0 / 3 votes

1. Widal test

   The Widal test is a presumptive serological test for enteric fever or undulant fever whereby bacteria causing typhoid fever are mixed with serum containing specific antibodies obtained from an infected individual. In case of Salmonella infections, it is a demonstration of the presence of O-soma false-positive result. Test results need to be interpreted carefully in the light of past history of enteric fever, typhoid vaccination, and the general level of antibodies in the populations in endemic areas of the world. Typhidot is the other test used to ascertain the diagnosis of typhoid fever. As with all serological tests, the rise in antibody levels needed to perform the diagnosis takes 7–14 days, which limits it applicability in early diagnosis. Other means of diagnosing Salmonella typhi include cultures of blood, urine and faeces. These organisms produce H2S from thiosulfate and can be easily identified on differential media such as Bismuth sulfite agar. Often 2-mercaptoethanol is added to the Widal test. This agent more easily denatures the IgM class of antibodies, so if a decrease in the titer is seen after using this agent, it means that the contribution of IgM has been removed leaving the IgG component. This differentiation of antibody classes is important; as it allows for the distinction of a recent from an old infection.

Matched Categories

1. • Agglutination Test

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Numerology

1. Chaldean Numerology

   The numerical value of widal test in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of widal test in Pythagorean Numerology is: 5

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=widal test
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Widal_Test
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Widal_Test
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=widal test