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About 88 percent. participants who tested negative for COVID-19 had antibodies for six months, reported the UK Biobank, a giant biomedical database. 99 percent. the subjects’ antibodies remained for three months.
These results support the findings of other smaller studies that showed that immunity persisted for at least 6 months after natural infection.
Health experts said it was not yet clear how long the immunity developed by vaccines would last. Furthermore, an increase in viral mutations may mean that revaccination may be required periodically to maintain the efficacy of the vaccine.
The study ran from May to early December, based on monthly blood samples and data on possible symptoms from Biobank participants, their adult children, and grandchildren.
The most common symptom associated with having antibodies to COVID-19 was loss of taste and smell, which was reported in 43%. Participants. About a quarter had no symptoms.
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