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医学上往往有这样的事情:看来似乎是最简单的课题,实际上却是最棘手的问题。在注射伤寒疫苗后体验过肿痛、发烧反应的人,大概都曾感到纳闷:要做到预防这种疾病,为什么竟如此困难?这种疫苗不仅在许多注射过的人身上引起副作用,而且远谈不上完全有效,至少每三年就得注射一次。至于霍乱免疫,那就令人更不愉快了。不仅如此,效果也差,其有效期只能勉强保持六个月。
Medicine often has such a thing: it seems to be the simplest subject, but it is actually the most intractable problem. People who experience sore throat and fever after an injection of a typhoid vaccine have probably wondered why it is so difficult to prevent the disease. The vaccine not only causes side effects on many injected people, but also far Totally effective, at least once every three years. As for cholera immunity, it is even more unpleasant. Not only that, the effect is poor, its validity can only be barely maintained for six months.