A new phenomenon amongst some Covid-19 patients which has been dubbed 'happy hypoxia' is leaving doctors battled. Medics say some people suffering with the disease have been able to sit up and talk and scroll their phones despite having dangerously low oxygen saturation levels.
Two Manchester based doctors have spoken out about the "abnormal" phenomenon and have warned it could be deadly. Most physically well people would have a normal blood-oxygen saturation of around 95 percent.
However, doctors treating people with Covid-19 say for some patients this can drop into the 80s, 70s and 60s with other more serious cases even lower.