There are quite a number of asymptomatically infected in the population, and they may discharge hepatitis A virus at certain times and under certain conditions.
无染者在人群中
数不少,在一定时期和条件下也可
出甲肝病毒,但此时带毒者常活动自如,不易管理,因
传染源有重要意义。
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He also pointed out other vaccines, such as the common polio vaccine used now, and the hepatitis A vaccine, show that a booster four to six months after the original shot provides a powerful and long-lasting increase in immunity.
他还指出,其他,如现在使用的普通脊髓灰质炎
和甲型肝炎
,表明在最初注射后四到六个
进行加强免
可提供强大而持久的免
力增强。