My son Widal blood test indicates that Salmonella Typhi (H) value is 1:40 dilution and is declared positive by the lab. I have learned that if it is more than 1:60, it means he is infected. Is this correct? He does not have any other problems except high fever of 103 and headache, but the fever repeats at four hour intervals.

Answered by 1 Apollo Doctors

Dr Vasanthasree Nair

General Practitioner

MBBS
15+ Yrs

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A Typhi H titer of 1:40 is not conclusive for typhoid, greater than or equal to 1:160 is more suggestive of active infection in endemic areas. False positives are common with Widal due to past exposure or vaccination. Repeating the Widal test after 5 to7 days to see rising titers is recommended. Fever every 4 hours may suggest viral, malaria, or early enteric fever. Consult a doctor if the fever persists for more than 3 days.

Dr. Vasanthasree Suggests...

Take a COMPLETE BLOOD COUNT (CBC) Test or Take a CULTURE AND SENSITIVITY - AEROBIC (BLOOD) Test

Book COMPLETE BLOOD COUNT (CBC) Test Book CULTURE AND SENSITIVITY - AEROBIC (BLOOD) Test

Answered 17/09/2025

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Disclaimer: Answers on Apollo 247 are not intended to replace your doctor advice. Always seek help of a professional doctor in case of an medical emergency or ailment.