Hi..... The important factor is the level of the O and H agglutinin titer levels. If this number is below 1:160, it is normal. If, however, it is over 1:160, you may have typhoid fever or another salmonella related illness. The Widal test report can produce a false positive for typhoid because it cannot interpret the difference between a person currently ill with typhoid and one who has recovered and is a carrier or one who simply has been vaccinated against the disease...