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Virus infection creates immunity for at least six months
Published on: 2020-11-23
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Individuals infected with coronavirus are unlikely to catch the illness again for at least six months, researchers at the University of Oxford said Friday.

The finding comes as part of a large-scale study into COVID-19 reinfection after observations from health care professionals that the phenomenon was relatively rare.

Oxford University Professor David Eyre, one of the authors of the study, said the findings were "really good news".

"We can be confident that, at least in the short term, most people who get COVID-19 won't get it again," he said.

The authors highlighted they had not yet gathered enough data to make a judgement on reinfection after six months.

However, the ongoing study has an end goal of verifying how long protection from reinfection lasts in total.

The director of infection prevention and control at study partners Oxford University Hospitals (OUH), Katie Jeffery, called the finding "exciting".

It indicated "that infection with the virus provides at least short-term protection from re-infection", she added.

US biotech firm Moderna announced this week its vaccine candidate was nearly 95 percent effective in a trial — a week after similar results were announced by pharma giant Pfizer and its German partner BioNTech.

The Oxford study into reinfection drew on data from regular coronavirus testing of 12,180 health care workers at OUH over a period of 30 weeks.

It found that none of the 1,246 staff with coronavirus antibodies developed a symptomatic infection.

Three members of staff with antibodies did test positive for the virus that causes COVID-19 but were all well and did not develop symptoms.

新冠初次感染后六个月内再感染可能性极小

牛津大学周五发表一项迄今为止最大规模的新冠再感染的研究报告,研究显示,感染过新冠病毒的人,6个月内再次感染新冠的可能性“极小”。

这项研究通过对今年4月至11月的30周时间内,牛津大学医院的12180名卫生保健工作者进行调研,首次揭示了人们在感染新冠病毒后,能多大程度预防再次感染。

牛津大学的研究人员表示,新的发现是令人兴奋的,因为是人们理解新冠免疫如何发挥作用的重要一步。

理解新冠的免疫机制对于疫苗的研发至关重要。此前,辉瑞和BioNTech以及Moderna分别公布了后期临床试验的中期分析数据,阿斯利康和牛津大学的疫苗临床二期结果也显示,疫苗能在所有人群中产生类似的免疫作用。

在牛津大学长达30周的研究中,研究人员对牛津大学医院的工作人员进行了病毒抗体检测,以确定他们是否已经感染过新冠病毒;并且当他们出现不适症状时,再次对其进行例行的核酸检测。

调查结果显示,在没有抗体的11052名员工中,有89名出现了新的症状性的新冠感染。但是,在拥有抗体的1246名员工中,没有一个人出现症状性感染。研究还发现,拥有抗体的人在无症状感染的筛查中感染的几率也较小。

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