二次感染

• Common Medications Can Prolong Back Pain When Overused, Study Says – The New York Times
• Scientists study links between obesity, age and body chemistry — ScienceDaily
• Increased mutations in children can be traced back to mistakes in father’s sperm — ScienceDaily
• Dr. Sanjay Gupta: The US is running a fever. Which way will it go? – CNN
• Excessive sports training may have negative effects on mood — ScienceDaily

在公司得知老板的老板在墨西哥感染了 COVID，也因此已經在那裏多待了兩個多星期，無法返回西雅圖，這是他第二次感染 COVID。

第一次感染的症狀輕微，這一次聽他的聲音還很嚴重呢！