IgM antibody levels are highest three to five weeks after the onset of illness and persist for about two months.

IgM病毒抗体水平在发病后3 - 5周内最高，此后持续约两个月。

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In fact, in the new manual, if symptoms like these persist for more than two weeks, the bereaved person will be considered to have a mental disorder: major depression.

实际上，在新手册里，如果这些症状持续时间超过两周，丧亲的人就会被认为得了精神疾病：重度抑郁。

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Bridgeport Mayor Bill Finch said such travel headaches could persist for weeks because the two tracks affected by the derailment -- which are both "shot right now" -- may take weeks to repair.

CNN: Feds to probe Connecticut train crash

Bridgeport Mayor Bill Finch said Friday that travel headaches could persist for weeks because the two tracks affected by the derailment -- which are both "shot right now" -- may take weeks to repair.

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