A key unsolved question in the current coronavirus disease 2019 (COVID-19) pandemic is the duration of acquired immunity. Insights from infections with the four seasonal human coronaviruses might reveal common characteristics applicable to all human coronaviruses. We monitored healthy individuals for more than 35 years and determined that reinfection with the same seasonal coronavirus occurred frequently at 12 months after infection.

中文翻译：

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季节性冠状病毒保护性免疫力很短。

当前2019年冠状病毒病（COVID-19）大流行中尚未解决的关键问题是获得性免疫的持续时间。四种季节性人类冠状病毒感染的见解可能揭示了适用于所有人类冠状病毒的共同特征。我们对健康个体进行了超过35年的监测，并确定在感染后12个月经常发生相同季节性冠状病毒的再感染。