<human>: my brother is 3 years old we have taken the  widal test for typhoid please can anybody tell me the typhoid is present or notreport:salmonella typhi o antigen 1:160salmonella typhi h antigen 1:160salmonella paratyphi ah 1:80salmonella paratyphi bh 1:80
<bot>: Hello, Welcome to Chat Doctor, The Tidal test is a serological test for typhoid, this test is not a diagnostic test but the test can reused in a suspected case of typhoid fever where the patient is having fever for more than 7 days. The typhoid fever can be suspected if there is a raising titre of fourfold increase in the tier (e.g., from 1:40 to 1:160) in the course of the infection. The Tidal test is positive if Salmonella type O and H antigen triter is more than 1:160 in an active infection. The lab reports suggest me that your brother is maybe having typhoid fever, because there is a raising titre of O and H antigens. Thank you.