三种金属阳离子盐液的诱导形成和保护伤寒沙门菌Vi抗原作用的研究

The Induction and the Prevention of Vi Antigen of S.typhi Loss by Three Metalic Ions of Salts

本法以Mg2+、Ca2+、Fe2+3种金属阳离子盐液诱导产生和保护伤寒沙门菌Vi抗原。结果表明，96株Vi－Ⅱ噬菌体标准菌100．0％为Ⅴ型菌；1320株地方菌株中1292株菌为Ⅴ型菌，占97．9％，28株菌为W型菌，占2．1％。优于其他关于Vi抗原每年丢失率为5．0％的报道。

Three metalic salts Ferrous, Mgnesium and Calcium were used to induce and to prevent Vi antigen of S.typhi loss.All of the 96 Vi-Ⅱ phage typing standard strains belonged to V type (a recovery rate of 100%). Out of 1320 local strains, 1292 were type V (a recovery rate of 97. 7 % )and 28remained tyPe W with a Vi loss rate of 2. 1 %. The results showed that induction and prevention of Vi antigen of S. typhi loss by the three metalic salts was higher than that of other reports which showed a loss rate of 5 % Vi antigen of S. typhi.