The fall was greater in those over 65, compared with younger age groups, and in those without symptoms compared with those with full-blown Covid-19. 與年齡較小的年齡組相比,年齡在65歲以上的人的跌幅更大,與有症狀的Covid-19的人相比,無症狀的人的跌幅更大。
The number of healthcare workers with antibodies remained relatively high, which the researchers suggest may be due to regular exposure to the virus. 具有抗體的醫護人員的數量仍然相對較高,研究人員認為這可能是由於定期暴露於該病毒引起的。
But he said it was possible that some people might need follow-up booster doses of any vaccine that became available to top up fading immunity over time. 但是他說,有些人可能需要跟進任何疫苗的後續加強劑量,以隨著時間的推移補充衰落的免疫力。