What is false positive in widal test

widal slide is easier and it save time but widal tube test is not easy and it takes time.

I mean widal test result positive after treatment

Isolated Widal test reading does not have much clinical significance. Rising titre of Widal test done one week apart, in a febrile patient, indicates typhoid fever. You can have such rising titre of Widal test in healthy patient, after dose of typhoid vaccine.

1:80 titre is significant for determination of widal positive.