The authors investigated 21 groups with hepatitis A (HA) introduction into 16 day-care centers in a district of Xi'an, studied the infection condition and the effect of population immunity against HA on the HA transmission. The results showed that when the level of population immunity prior to HA introduction was below 50 percent, population immunity played no significant role in the HA transmission.
|Original language||English (US)|
|Number of pages||3|
|Journal||Zhonghua liu xing bing xue za zhi = Zhonghua liuxingbingxue zazhi|
|State||Published - Aug 1993|
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