A medical worker tends a COVID-19 patient at General Hospital Karlovac in Karlovac, Croatia, Oct. 28, 2020. (Kristina Stedul Fabac/Pixsell via Xinhua)
A medical worker operates an oxygen tank in a COVID-19 ward at General Hospital Karlovac in Karlovac, Croatia, Oct. 28, 2020. (Kristina Stedul Fabac/Pixsell via Xinhua)