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What gives some people immunity from the novel coronavirus, the virus that causes COVID-19?
Some scientists are studying whether it is the presence of antibodies.
Others are studying a part of the human immune system, known as T cells, which can protect people from viruses.
Recent studies show that some recovered patients who tested negative for coronavirus antibodies developed T cells in their immune systems.
The reaction is believed to be the result of their COVID-19 infection.
The studies are small and have yet to be confirmed by outside experts.
However, some scientists now say that people who show few signs of sickness from the new coronavirus, or show no signs at all,
may be actually killing off the infection with their T cells.
The findings add to the evidence that an effective COVID-19 vaccine will need to push T cells to work in addition to producing antibodies.
什么使有些人对引发新冠肺炎的新冠病毒具有免疫力?
一些科学家正在研究抗体是否存在。
其他人则在研究人类免疫系统的组成部分――可保护人们免受病毒侵害的T细胞。
最近的研究表明,一些康复患者在冠状病毒抗体检测中呈阴性,但他们的免疫系统中产生了T细胞。
这种反应被认为是他们感染新冠肺炎的结果。
这项研究规模很小,而且尚未得到外部专家的证实。
然而,现在一些科学家表示,几乎未出现新冠病毒感染迹象或完全没有迹象的人,
可能实际上正在用他们体内的T细胞消灭感染。
这项发现补充了证据,证明有效的新冠肺炎疫苗除了产生抗体以外,还需要推动T细胞发挥作用。
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