根据病原体感染的次数、时间先后和种数，感染可分为四种,不包括

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30932' and id < 2489597 and id<>'2489597' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30932' and id > 2489597 and id<>'2489597' order by id asc limit 5