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罗马尼亚采用加热杀菌酚防腐的液体伤寒菌苗后,伤寒发病率不断下降,这种液体菌苗的使用期限仅有两年。为了应付意外的暴发流行及其他流行情况,因而研制了一种用喷枪作皮内注射用的快速免疫的冻干菌苗。这种菌苗系用伤寒杆菌
After the use of liquid bactericidal and antiseptic liquid typhoid bacillus in Romania, the incidence of typhoid fever has been declining. The duration of use of such liquid bacterin is only two years. In order to cope with unexpected outbreaks and other epidemics, a rapid immunization freeze-dried bacterin using a spray gun for intradermal injection has been developed. This bacterium is used Salmonella typhi