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。

youdao

Initial findings indicate poultry die off in the vicinity of the case's home in the week prior to the onset of illness.

初步结论表明在该病例发病前一周内，其住所附近有禽类死亡。

youdao

Investigators have not been able to confirm any direct contact between the patient and poultry prior to the onset of illness.

调查人员未能确认患者在发病前与禽类的任何直接接触。

youdao

Seven patients said they had traveled to Mexico during the week before onset of illness.

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"Importantly, however, the onset of illness forced him to leave his home and thus to lose his independence, " the judge said.

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The most common symptoms are fever, cough, sore eyes and a rash that develops three or four days after the onset of illness, starting with the face and head and spreading down the body.

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