據美媒報導,美國疾控中心日前發布研究稱,去年12月中旬新冠病毒可能已經出現在美國。
當地時間12月1日,美國媒體《華爾街日報》報導稱,一項政府研究報告顯示:新冠病毒可能早在2019年12月中旬就已經在美國傳播,這比公共衛生當局發現的第一例美國病例早了約一個月。
The new coronavirus infected people in the US in mid-December 2019... about a month earlier than public health authorities found the first US case, according to a government study published Monday.
據這份發表於《臨床傳染病》期刊上的研究報告顯示,美國疾控中心的科學家們在去年12月13日至今年1月17日期間從9個州收集的7389個血液樣本中,發現其中106個樣本有感染新冠病毒的證據。
Scientists at the US Centers for Disease Control and Prevention found evidence of infection in 106 of 7,389 blood donations collected by the American Red Cross from residents in nine states across the US, according to the study published online in the journal Clinical Infectious Diseases.The scientists based their study on blood samples that the American Red Cross collected between Dec 13 and Jan 17 and later sent to the CDC for testing to see if any had antibodies to the new coronavirus, which is named SARS-CoV-2.報導稱,這一新發現表明早在公共衛生部門和研究人員意識到之前,新冠病毒就已在世界各地傳播,這不僅大大夯實了相關證據,也顛覆了人們對該病毒究竟何時、何地出現的最初認知。The findings significantly strengthen evidence suggesting the virus was spreading around the world well before public health authorities and researchers became aware, upending initial thinking about how early and quickly it emerged.在檢測美國紅十字會收集的血樣時,美國疾控中心的研究人員發現,去年12月13日至12月16日期間收集的39份來自加利福尼亞州、俄勒岡州和華盛頓州的樣本中含有新冠病毒抗體。人體免疫系統只有在接觸到與病毒一致或高度相似的病原體時,才會產生抗體。
這說明,早在去年12月中旬,美國西海岸已出現零星新冠病毒感染病例。
In analyzing the blood samples, the CDC scientists found antibodies in 39 samples from California, Oregon and Washington state collected between Dec 13 and Dec 16.
The findings suggest there were isolated cases of coronavirus infection on the US West Coast in mid-December, the scientists wrote.
另外,研究人員在去年12月30日至今年1月17日期間採自麻薩諸塞州、密西根州、威斯康星州、艾奧瓦州、康乃狄克州和羅德島州的67份血樣中也檢測出了新冠病毒抗體。
這表明,今年年初,美國新冠病毒感染已擴散,但仍屬零星病例。
They also found 67 samples with antibodies in Massachusetts, Michigan, Wisconsin or Iowa, and Connecticut or Rhode Island collected between Dec 30 and Jan 17.
Those findings indicated that cases were more dispersed—yet still isolated—by early this year.
▌大多數血樣中含新冠病毒特異性抗體
參與血樣檢測的美國疾控中心研究人員強調,血樣中的抗體並非普通感冒病毒等其他冠狀病毒產生的抗體,因為血樣中含有新冠病毒特異性抗體。
The scientists said they ruled out the possibility that the antibodies they found had developed to fight off other coronaviruses, which cause the common cold. They did that by looking for antibodies specific to the new coronavirus in 90 of the samples.
科學家們稱,為了排除這些被發現的抗體是由其他諸如普通感冒等冠狀病毒產生的可能性,他們在90個樣本中,有針對性地尋找了新冠病毒的抗體。
They said they found antibodies specific to SARS-CoV-2 in 84 of the samples, or nearly all of them.
結果,84個樣本中(近乎所有樣本)發現了SARS-CoV-2的特異性抗體。
美國在2020年1月19日報告首例新冠確診病例,但按照此次美國疾控中心公布的研究結果,美國在2019年12月或已出現了新冠病毒感染者。
Not only did Covid-19 likely appear in the US earlier than previously known, but researchers have found evidence that the virus is far more widespread in the US than testing indicates.
新冠病毒出現在美國的時間可能比此前已知的更早,不僅如此,研究人員也發現了證據,證明該病毒在美國的傳播範圍比檢測結果表明的要廣泛得多。
越來越多的證據表明,新冠病毒在中國境外出現的時間要早於先前已知的時間。The results add to growing evidence suggesting Covid-19 was present outside of China earlier than previously known. Researchers found the virus, for example, in a retrospective analysis of a specimen from a patient who was hospitalized in France on Dec 27, 2019.
這一研究結果與越來越多的證據都表明,新冠病毒在中國境外出現的時間要早於先前的已知時間。比如,研究人員在回顧分析法國2019年12月27日入院的一名病人樣本時,也發現了新冠病毒。
病毒溯源是一個複雜的科學問題,美國究竟什麼時候出現的新冠肺炎,一直備受全球關注。早在今年5月,美媒通過對佛羅裡達州官方公布數據的分析發現,該州最早在1月就已經出現了有新冠肺炎症狀的患者。蹊蹺的是,在公布數據之後,佛羅裡達州連夜刪除了關鍵信息。雙語君有視頻號啦!
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