<s>[INST] Hi I have under gone to widal test, and below are the test results: Salmonella typhi O: 1 in 40 dilution Salmonella typhi H: 1 in 80 dilution Salmonella para typhi AH: 1 in 40 dilution Salmonella para typhi BH: 1 in 20 dilution Is any one there to help on explaining me about the test results Balaji [/INST] Hello thank you for your contact to healthcare magic. If I am your treating doctor I would like to tell you that widal titre of 1:160 or above is considered positive. You have 1:80 titre, which I consider it to be negative. But ideal procedure is that you have to count the community titre and accordingly the cutoff is to be decided. If you have any thing else to know kindly contact me. Dr.Arun Tank and I am infectious disease specialist. Thank you </s>