1、
the severity of disease ranges from a mild cough to a rapidly fatal pneumonia.
疾病严重程度从轻微咳嗽到迅速致命的肺炎。
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2、
there is also usually an initial mild cough, but as many as 50% of patients can present phlegm.
通常最初还有轻微咳嗽，但多达50%的病人可有粘痰。
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3、
4、
a mild fever, a cold, a cough, a sore throat, or sore, red eyes (conjunctivitis).
轻度发烧、发冷、咳嗽、咽喉痛或是红眼（结膜炎）、疼痛。
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