警惕！欧洲也出现“二次感染”新冠病例
据荷兰国家广播公司（NOS）25日消息，两名欧洲患者被证实再次感染新冠病毒。
报道称，在中国香港地区出现全球首例“二次感染”新冠肺炎病例后，荷兰和比利时也各有一名患者被证实二次感染新冠病毒。
A patient in the Netherlands and another in Belgium have been confirmed as having been reinfected with the coronavirus, Dutch national broadcaster NOS reported on Tuesday, citing virologists.
报道援引荷兰病毒学家马里恩·库普曼斯（Marion Koopmans）的话称，这名荷兰患者年纪较大，免疫系统较弱。
The NOS cited virologist Marion Koopmans as saying the Dutch patient was an older person with a weakened immune system. She said that cases where people have been sick with the virus a long time and it then flares up are better known.
库普曼斯表示，二次感染是预期中的事，“有些人会二次感染，这并不会让我感到紧张。但我们必须观察这种情况是否经常发生。”
Koopmans, an adviser to the Dutch government, said reinfections had been expected.
"That someone would pop up with a reinfection, it doesn't make me nervous," she said. "We have to see whether it happens often.”
报道还称，比利时病毒学家马克·范·兰斯特（ Marc Van Ranst）表示，比利时这名患者症状相对较轻，但“这不是一个好消息”——因为这表明患者在第一次感染时产生的抗体，不足以防止第二次感染稍有不同的变异新冠病毒。
The Belgian patient had mild symptoms, the NOS cited virologist Marc Van Ranst as saying. But "it's not good news," he added.
He said the case shows antibodies the patient developed during the first exposure were not enough to prevent a second case with the slightly different variant of the virus.
他指出，是否会有更多人在康复六个月或七个月后再次感染新冠病毒，目前尚不清楚。
He said it is not clear whether such cases are rare or whether there are "many more people who could have a reinfection after six or seven months."
此前一天，香港大学微生物学系团队证实，一名新冠肺炎康复者自欧洲返回香港后，其新冠病毒检测结果再次呈阳性，为第二次感染新冠病毒，而非“复阳”，属全球首例。
The news follows a report this week by researchers in Hong Kong about a man there who had been reinfected four and a half months after being declared recovered.
A 33-year-old Hong Kong man who recovered from COVID-19 was infected again four-and-a-half months later in the first documented instance of human reinfection, researchers at the University of Hong Kong said on Monday.
He was found to have contracted a different coronavirus strain from the one he had previously contracted and remained asymptomatic for the second infection.
病毒学家强调说，确定是否是第二次感染新冠病毒，需要对第一次和第二次感染的病毒进行病毒基因检测，以查明两种病毒是否略有不同。
A true reinfection, as in the Dutch, Belgian and Hong Kong cases, requires genetic testing of the virus in both the first and second infection to see whether the two instances of the virus differ slightly.