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研究人员在《新英格兰医学杂志》(New England Journal of Medicine)上发表文章说,感染过Covid-19并且恢复可能无法保证将来不会被感染,特别是对于只有轻度症状的人来说。
该报告分析了34位曾感染Covid-19并康复后的患者血液中提取的抗体,这些患者患病时症状较轻,且不需要重症监护。第一次分析是对症状开始后37天左右提取的抗体进行的,第二次分析是在大约86天后或不到三个月内进行的。研究人员确定抗体水平在这期间急剧下降,与SARS相比,Covid-19抗体的消失发生得更快。报告的结论是,轻度感染者对Covid-19的免疫力可能不会持续很长时间。报告还指出,虽然抗体对预防感染Covid-19的保护作用尚不完全清楚,但通常来说它们可以很好地起到某种保护作用。
Recovering from Covid-19 may not offer much protection from future infections, particularly for those with only a mild case, researchers said in the New England Journal of Medicine.
The study analyzed antibodies taken from the blood of 34 patients who had recovered after suffering mainly mild symptoms that didn’t require intensive care, according to the report.
The first analysis was done on antibodies taken an average of 37 days after symptoms began, with a second after about 86 days, or less than three months. The researchers determined that antibody levels had fallen precipitously, with a half-life of about 73 days between the two time frames. The loss of antibodies occurred more quickly than with SARS, an earlier type of coronavirus infection. It is likely that the decline will slow with additional time, the authors said.
The findings raise concern that immunity from an infection may not last long in people who develop a mild infection, which accounts for the majority of cases. While the protective role of antibodies against infection with the novel coronavirus isn’t fully understood, they are generally considered a good representation of some protection against infection in general, according to the report. source
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