下列哪一个时期，小儿生理性免疫功能最低下

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27909' and id < 2291784 and id<>'2291784' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27909' and id > 2291784 and id<>'2291784' order by id asc limit 5