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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Does "S.typhi H:positive 1/160 And S.typhi O:positive 1/80" Suggest?

Hi. I am 22/f and I have been down with fever and flu-like symptoms since the past 3 days. I took a blood test today and yielded these results in Widal test:
S. typhi H: positive 1/160
S. paratyphi B-H: positive > 1/320
S. typhi O: positive 1/80
S. paratyphi B-O: positive 1/80
What does this mean?
Thu, 12 Jun 2014
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Infectious Diseases Specialist,  's  Response
Hello,
Welcome to HCM,

As you are having symptoms like fever and flu like symptoms for last 3 days for which your doctor has advised to undergo widal test.

The widal test revealed S.Typhi 'H' - Positive 1:160 and S.Typhi 'O' - 1/320 suggest that you are typhoid fever but widal test is not a confirmatory test for typhoid. If there is a rising titres of widal it is suggestive of typhoid fever.

As widal test is done after 3 days of fever it should be confirmed by blood culture and this is the best indicator of typhoid fever during the first week of the fever.
Thank you.
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What Does "S.typhi H:positive 1/160 And S.typhi O:positive 1/80" Suggest?

Hello, Welcome to HCM, As you are having symptoms like fever and flu like symptoms for last 3 days for which your doctor has advised to undergo widal test. The widal test revealed S.Typhi H - Positive 1:160 and S.Typhi O - 1/320 suggest that you are typhoid fever but widal test is not a confirmatory test for typhoid. If there is a rising titres of widal it is suggestive of typhoid fever. As widal test is done after 3 days of fever it should be confirmed by blood culture and this is the best indicator of typhoid fever during the first week of the fever. Thank you.