中新网北京8月20日电(蒋鲤)近日，美国农业部对本国白尾鹿血液样本发展检验发觉，2019年的鹿血样本中有1例携带了新冠病毒抗体，这意指着，早在2019年，美国白尾鹿族群内就已显露了新冠病毒感染。这一发觉没有疑将新冠病毒全世界溯源事业前进推行了一大步。 探讨还发觉，本年1至3月在美国东北部采集到的385个白尾鹿血液样本中，约40%验出抗体。这讲明，北美大陆常见的野生动物白尾鹿已大范围感染新冠病毒，但美国农业部声称无寻到原因。 美国农业部以为，2019年的样本里唯有一种阳性，因而很可能是“假阳性”，但这一结论赫然站不住脚。其探讨方法运用的是极为精确的中和抗体检验技艺，而且采用了两种技艺发展双重检验，相互印证的结果是抗体仍旧显现阳性。 科学技艺是检测病毒最可靠的伎俩。然则，虽然美国农业部对外推出了这一考查结果，但一直“叫嚷”着请求发展新冠病毒溯源的部分政客和媒体，没有一例外埠对此抉择了“闭嘴”和“没有视”，这还是为何呢？ 赫然，这一考查结果将来会推翻美国一直别有效心炒作的针对武汉实验室的有罪推定式考查。同一时间，也会障碍美国将新冠溯源政治化以嫁祸华夏的图谋。 实是上，5月10日，美国农业部传染病探讨行家米切尔·帕尔默团队就在《病毒学》发表论文称，日前的证据表达新冠病毒可能从动物宿主传染让人类，而白尾鹿与人类在新冠病毒受体方面高度同源，因而，新冠病毒很可能经过当中动物宿主(比如白尾鹿)传让人类。这一发觉扶持将野生鹿科动物归入到新冠病毒的潜在宿主或来自中发展考查。 而之前华夏-世卫组织结合溯源探讨的汇报也指明，新冠病毒从当然宿主经过当中宿主再过渡到人是若干路径中最有可能的。 美国一边坚称信任科学，一边又对科学的考查结果置若罔闻。无真凭实据却大肆炒作所谓的“武汉实验室泄漏论”，面临世界社会对德特里克堡的重重质疑，愈是避而不谈。 是以，美国到底是信任政治，仍是信任科学呢？ 世界社会纷纷呼吁客观公正地展开全世界病毒溯源探讨，美国不应为这生产阻碍。当下，本着科学透明的态度，应允对白尾鹿感染病毒事故发展考查，助力世界社会早日揭开新冠病毒源头的谜团才是美国应当做的。(完) COVID-19 origin tracing: Is the U.S. prone to rely on politics or science? By John Lee (ECNS) -- A study conducted by researchers from the U.S. Department of Agriculture (USDA) has detected SARS-CoV-2 antibodies in a blood sample of a U.S. white-tailed deer collected in 2019. It means the wild U.S. deer was exposed to the coronavirus as early as in 2019, thus pushing forward the timeline of Covid-19 origin tracing. Researchers also analyzed blood samples taken from 385 white-tailed deer from Pennsylvania, Michigan, Illinois, and New York from January to March, 2021. Nearly 40 percent of them were found carrying SARS-CoV-2 antibodies. The study proves that white-tailed deer in these populations have been infected with the coronavirus on a large scale. The USDA claimed it didn't know how the deer were exposed to the virus. The USDA says that the single outlier in 2019's samples was almost certainly a false positive since it had a very low level of antibodies. However, researchers used a SARS-CoV-2 antibody screening test that has been highly accurate with other species. The USDA also helped exclude the chances of cross-reactivity through testing a subset of the samples using a second type of antibody test even more specific to SARS-CoV-2. Results from the second test mirrored the earlier findings, proving that SARS-CoV-2 antibodies do exist in the sample. Nevertheless, some U.S. politicians and media refuse to accept such a scientific result. Obviously, this result will overturn the Wuhan lab-leak theory that they have hyped, obstruct the U.S. politicizing origin tracing and prevent it from using China as a scapegoat. A research paper called Susceptibility of White-Tailed Deer (Odocoileus virginianus) to SARS-CoV-2 published on Journal of Virology on May 10, 2021 by Mitchell V. Palmer team, professional in infectious disease research, has suggested that coronavirus is likely spillover into humans from animals. Considering that SARS-CoV-2 binds to the angiotensin-converting enzyme 2 (ACE2) receptor of human cells and the white-tailed deer, whose ACE2 receptors are highly homologous to human-ACE2, the species is susceptible to the virus. This research supports scientists to probe into the animal host (white-tailed deer) range of SARS-CoV-2. What's more, the previous joint study report by the WHO and Chinese scientists also endorses that the transition of the coronavirus from natural host to humans through the intermediate host is the most possible among many paths. The U.S. launched the origin tracing in the name of science and keeps hyping "lab-leak" theory without clear evidence, but when it comes to the virus found at home, it turns a deaf ear to scientific results. It refuses to answer questions concerning Fort Detrick. So, does the country believe in politics or science? The U.S. should not stand in the way of COVID-19 origin tracing as the international co毫米unity unanimously calls for a scientific and objective investigation. It is an urgent mission for the U.S. to further conduct investigations into the deer carrying coronavirus antibodies and help the world find the origin of the virus at an early date.
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