What is false positive in widal test
I mean widal test result positive after treatment
A positive Widal test can suggest typhoid fever, as it detects antibodies against specific Salmonella antigens. However, it is important to note that the Widal test can yield false positives due to prior infections or vaccinations, and its sensitivity and specificity can vary. Therefore, a positive Widal test should not be solely used for diagnosis; it should be corroborated with clinical symptoms and other diagnostic methods for accurate confirmation of typhoid fever.
1:80 titre is significant for determination of widal positive.
To a certain extent yes.The post antibiotics Widal Test will have Low titers of agglutinins.Hence the test may be reported as False Negative.
positive or negative with approximately titre.
As this test is positive, it clearly means that you have typhoid.
Widal test is negative in incubatory carrier. Widal test is always positive in chronic carrier.
The main difference between the Widal slide test antigen and the Widal tube test antigen lies in the method of reaction visualization. In the Widal slide test, the reaction is observed on a glass slide under a microscope, whereas in the Widal tube test, the reaction is seen in small test tubes. Both tests detect antibodies against specific Salmonella antigens, but differ in their setup and visual interpretation.
Isolated Widal test reading does not have much clinical significance. Rising titre of Widal test done one week apart, in a febrile patient, indicates typhoid fever. You can have such rising titre of Widal test in healthy patient, after dose of typhoid vaccine.
A positive Widal test result for Salmonella Typhi O indicates the presence of antibodies against the O antigen of Salmonella Typhi, suggesting a possible active or recent infection with typhoid fever. However, this test may yield false positives due to cross-reactivity with other infections or previous vaccinations, so it should be interpreted alongside clinical symptoms and other diagnostic tests. Additionally, the test is more reliable in endemic areas where typhoid fever is common.
Positive = You really did it. False Positive = The test said you did it, but you really did not.
If the test is done properly, the chances to give false positive test are very slim indeed.