New research has discovered that coronavirus tests may be finding dead traces from weeks-old infections, resulting in false positives that inflate the scale of the pandemic.

The study was carried out by experts from the University of Oxford’s Centre for Evidence-Based Medicine and the University of the West of England. It found there was a risk of “false positives” because of how Covid-19 testing is being conducted.

The scientists discovered that, despite people with Covid-19 being infectious for only around a week, one test used to detect the disease can still give a positive reading weeks after the patient has recovered.



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