传染病的基本特征是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31196' and id < 2504870 and id<>'2504870' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31196' and id > 2504870 and id<>'2504870' order by id asc limit 5