【答】过去规定五联(霍乱、伤寒、副伤寒甲、乙菌苗、破伤风类毒素)疫苗在第一年全程注射(首次0.5ml,第二、三次各1.0ml,间隔4～6周)以后,每年需加强注射1次(1.0ml)。但后来此方法有改变,第一年注射3次(0.5、1.0、1.0ml,间隔2～4周)和第二年注射1次(1.0ml)以后方称之为全程免疫。经过此种全程免疫以后的5年之内,不得再用五联疫苗作加强注射。这是因为五联疫苗 [A] The past, the provisions of the five (cholera, typhoid, paratyphoid A, B vaccine, tetanus toxoid) vaccine in the first year of full injection (first 0.5ml, the second and third 1.0ml, 4-6 weeks ), Once a year to strengthen the injection once (1.0ml). But later this method has changed, the first year of injection three times (0.5,1.0,1.0ml, interval 2 to 4 weeks) and the second year of injection (1.0ml) later known as full immunity. After such full-course immunization within 5 years, no further vaccination should be used to enhance the injection. This is because the five vaccines