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What Does This Widal Test Report Indicate?

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Posted on Fri, 21 Aug 2015
Twitter Fri, 21 Aug 2015 Answered on
Twitter Fri, 18 Sep 2015 Last reviewed on
Question : I have done WIDAL Test asper the report
Salmonella typhii "O" : 1:40
Salmonella typhii "H" : 1:40
Salmonella Paratyphii A (H) : Neg
Salmonella Paratyphii B (H) : Neg
Dengue Antibody IgG: Positive
Dengue Antibody IgM:Negative
What does this report mean
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Answered by Dr. Suresh Heijebu (4 hours later)
Brief Answer:
Both tests are negative for respective diseases.

Detailed Answer:
Hello,

I understand your concern.

These results do not show that you have typhoid.

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 number of cross-reacting infections. Repeat test in case of persistent symptoms. Only a change I titer from 1/40 to 1/160 is significant in diagnosing Typhoid.


Regarding dengue antibodies, positive IgG represents an old/remote infection

In the absence of symptoms, this test is insignificant.

Post your further queries if any.

Thank you.
Above answer was peer-reviewed by : Dr. Vinay Bhardwaj
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Answered by
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Dr. Suresh Heijebu

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Practicing since :2010

Answered : 3646 Questions

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What Does This Widal Test Report Indicate?

Brief Answer: Both tests are negative for respective diseases. Detailed Answer: Hello, I understand your concern. These results do not show that you have typhoid. 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 number of cross-reacting infections. Repeat test in case of persistent symptoms. Only a change I titer from 1/40 to 1/160 is significant in diagnosing Typhoid. Regarding dengue antibodies, positive IgG represents an old/remote infection In the absence of symptoms, this test is insignificant. Post your further queries if any. Thank you.