A COVID-19 patient thumbs up to medical workers before he is moved out of an ICU ward of a hospital in Barcelona, Spain, on May 7, 2020. (Photo by Francisco Avia/Xinhua)

A COVID-19 patient poses for photos with medical workers before he is moved out of an ICU ward of a hospital in Barcelona, Spain, on May 7, 2020. (Photo by Francisco Avia/Xinhua)

A COVID-19 patient shakes hands with a nurse as he is moved out of an ICU ward of a hospital in Barcelona, Spain, on May 7, 2020. (Photo by Francisco Avia/Xinhua)

A COVID-19 patient holds the hand of a medical worker to show his appreciation in an ICU ward of a hospital in Barcelona, Spain, on May 7, 2020. (Photo by Francisco Avia/Xinhua)

A COVID-19 patient takes a selfie with medical workers before he is moved out of an ICU ward of a hospital in Barcelona, Spain, on May 7, 2020. (Photo by Francisco Avia/Xinhua)