reciprocal salmonella typhi o and h titers greater than or equal to 40 and greater than or equal to 80 , respectively , occurred in approximately 90 % of 42 mexican patients with bacteriologically-confirmed typhoid fever at the time of presentation to hospital and , by day 4 to 5 of clinical illness , in 70 % of u.s. adult volunteers who developed typhoid fever in the course of vaccine efficacy trials but in only 0.7 % ( o ) to 3 % ( h ) of 275 healthy individuals from a non-endemic area .
C0041466
typhoid fever
C0041469
typhoid fever