引起发热最常见的病因是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31198' and id < 2506909 and id<>'2506909' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31198' and id > 2506909 and id<>'2506909' order by id asc limit 5