The research also finds only 2.4% of fully vaccinated people who were pinged - but felt in normal health - tested positive, suggesting large numbers are being told to isolate unnecessarily.
Younger people who were alerted were also found to be more likely to test positive compared with older groups.
Professor Tim Spector, lead scientist of Zoe study, said the findings also show it's important for people to remain wary and get tested if they feel unwell in anyway. "Which makes it even more important for the government to expand the symptom list to help people understand all the symptoms of COVID-19.
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