Immunity against Covid-19 may last for years among those who have recovered from the virus and received a vaccine, two studies suggest.
Cells in bone marrow generated as part of an immune response may retain a memory of the virus and can produce long-lasting antibodies as a defence against future infections, according to researchers.
They indicate that these cells strengthen over a period of at least a year and that people who have developed this level of immunity may not need booster shots of the vaccine for a considerable period of time.
The two studies, published this week in Nature and on BioRxiv, a pre-print online research site, will give cheer to those concerned that antibodies produced after infection are short lived.
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