Covid-19 ward over Christmas Day and New Year says an Amazon oximeter saved her life. Nikki O'Hara was rushed to hospital days after testing positive for the virus on her son’s birthday, December 17.Her husband Rodger had already contracted the virus and suffered very mild symptoms.The 53-year-old describes herself as ‘fit and healthy’ and has no underlying health conditions.After testing positive for the virus, the children's charity director continued to work from her home in Strathaven, South Lanarkshire, while self-isolating.She decided to buy an oximeter that measures oxygen saturation levels with fingertip pulses on Amazon after pals suggested it, but assumed she would never have to use it.The mum of two credits the gadget with saving.