其认为白类的免疫持久性至少可维持8年。
It thought that Bai Lei the immunity durability may maintain at least for 8 years.
近年的研究表明，白类有较好的免疫持久性。
Recent years' research indicated that Bai Lei has the good immunity durability.
目的：观察A群流脑多糖菌苗的免疫效果和免疫持久性。
Objective: To observe the effect and endurance of the polysaccharose vaccine for prevention of epidemic encephalitis caused by Type a virus.
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