When we said widal test positive?


It is for diagnosis of Entric fever It is said to be + ve if it’s coming in increasing dilutions + ve 1: 80 dilutions today if we examine tomorrow’s it should be 1:120 on next day it should be 1:160 so on should be + ve in both capsular as well as in flaggeler

Typhi antigen positive Or tube method positive Or blood culture positive Generaly after 1 week of fever Slide method h or o titre more then 1 in 160 But correlate with leucopenia Neutrophilia

Widal test is not specific test for diagnosis of Typhoid fever Blood culture is most specific for diagnosis of Typhoid

The Widal test is positive if TO antigen titer is more than 1:160 in an active infection, or if TH antigen titer is more than 1:160 in past infection or in immunized persons. A single Widal test is of little clinical relevance especially in endemic areas such as Indian subcontinent, Africa and South-east Asia.


When s & o titers shows 1:160

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