el-Shafie S
Department of Microbiology, College of Medicine, Sultan Qaboos University, Al-Khod, Muscat, Sultanate of Oman.
East Afr Med J. 1991 Apr;68(4):266-9.
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 antibody titres of Salmonella typhi; (ii) the Widal test in the Sudan should be interpreted against this background; (iii) previous diagnostic titre of 1.160 for S. typhi results in high false positive results; (iv) a titre above 1.320 is suggested as diagnostic for S. typhi; 1.160 for both S. partyphi B and S. paratyphi A.
对苏丹杰济拉地区的114名正常人进行了肥达试验。其中12人（10.5%）的伤寒杆菌O凝集素效价为1:320。5人（4.3%）的甲型副伤寒杆菌凝集素效价为1:160，6人（5.3%）的乙型副伤寒杆菌“O”凝集素效价为1:160。这些人都没有伤寒病史或接种过伤寒、副伤寒甲、乙三联疫苗。由此得出以下几点：（i）苏丹的正常健康人伤寒杆菌抗体效价较高；（ii）在苏丹进行肥达试验应以此为背景进行解读；（iii）之前将伤寒杆菌诊断效价定为1:160会导致较高的假阳性结果；（iv）建议伤寒杆菌诊断效价高于1:320，甲型副伤寒杆菌和乙型副伤寒杆菌诊断效价为1:160。
