| the widal test in a normal healthy population in the sudan. | the widal test was performed in 114 normal individuals from the gezira area in sudan. salmonella typhi o agglutinins were found at a titre of 1.320 in 12 (10.5%) of them. salmonella paratyphi a agglutinins were found at 1.160 in 5 (4.3%) and salmonella paratyphi b "o" agglutinins were found in 6 (5.3%) at a titre of 1.160. none of these individuals had a history of typhoid fever or vaccination with tab vaccine. the following points emerged: (i) normal healthy people in the sudan have high antibo ... | 1991 | 1914976 |