IVANOVO, RUSSIA - DECEMBER 10, 2020: A pulse oximeter on a woman's fingertip at Ivanovo City Clinical Hospital No 3 that admits COVID-19 patients. Vladimir Smirnov/TASS (Photo by Vladimir Smirnov\TASS via Getty Images)
IVANOVO, RUSSIA - DECEMBER 10, 2020: A pulse oximeter on a woman's fingertip at Ivanovo City Clinical Hospital No 3 that admits COVID-19 patients. Vladimir Smirnov/TASS (Photo by Vladimir Smirnov\TASS via Getty Images)