History of travel to an endemic area, and 10) if no obvious cause is found for the fever within 3 weeks in the last case scenario, it becomes known as Pyrexia of unknown origin and requires extensive workup.

疫区旅行史；10）在最后一种情况下，如果在3周内没有发现明显的发烧原因，则称为不明原因发热，需要进行广泛的检查。