Recovered nurse from the coronavirus disease (COVID-19) Livan Lopez, 25, sits at the porch of his home during an interview in Havana, Cuba, June 17, 2020.

Recovered coronavirus patient John Walters takes a photo of his convalescent plasma donation bag at the Central Seattle Donor Center of Bloodworks Northwest during the coronavirus disease (COVID-19) global outbreak, in Seattle, Washington, U.S. September 2, 2020.

Nurse Jorge Catarino, 35, performs aerobic exercise as part of his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

Abdul Alim, 103, stands with his son Suhail Aziz and staff members wearing personal protective equipment (PPE) in this group photograph taken after he recovered from coronavirus disease (COVID-19) and was discharged from the Aga Khan Health Services Emergency Response Centre in Booni, Chitral, Pakistan in this undated photograph provided to Reuters. Suhail Aziz/Handout via REUTERS

Francisco Garcia, 31, who spent almost four months in hospital with coronavirus disease (COVID-19), recovers at his home, with his sister Lorena Garcia, 33, in Los Angeles, California, U.S., August 19, 2020.

Nurse Jorge Catarino, 35, performs aerobic exercise as part of his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

Belgian student Lili Deneve, who has recovered from coronavirus disease (COVID-19), donates plasma at the Belgian Red Cross blood collection center in Brussels, Belgium October 27, 2020.

Judie Shape, who was a resident at Life Care Center of Kirkland and who was infected and recovered at the start of the U.S. coronavirus disease (COVID-19) outbreaks, poses for a portrait while sitting with an old doll of her late husband which she made, after it was delivered with a Thanksgiving dinner by her daughter Lori Spencer, at Shape’s new care home in Seattle, Washington, U.S. November 26, 2020.

Rufino, a patient who recovered from the coronavirus disease (COVID-19), cries next to his son as he leaves the Juarez Hospital to go to his house in Mexico City Mexico, July 27, 2020.

Rufino, a patient who has recovered from the coronavirus disease (COVID-19), gestures next to his son as he leaves from the Juarez Hospital to go to his house in Mexico City, Mexico, July 27, 2020.

Nurse Jorge Catarino, 35, holds a piece of plastic as part of his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

A healthcare worker wearing a protective gear collects blood sample from a man, who has recovered from the coronavirus disease (COVID-19), during a plasma donation camp inside a classroom at a slum in Mumbai, India, July 24, 2020.

Leocadio, 38, a recovered Covid-19 patient, undergoes rehabilitation with a physical therapist while Dr. Judith Sanchez, head of the Vall d'Hebron hospital's physical medicine and rehabilitation centre, looks at him at the Hospital Vall d'Hebron facility, a hastily converted sports centre, in Barcelona, Spain, June 11, 2020.

Physiotherapist Ana Carolina Xavier of FamilyCare, a group specialising in mobile physiotherapy care, and who also works at the ICU of Lagoa-Barra field hospital for COVID-19 patients, is pictured as she returns to work after recovering from the coronavirus disease (COVID-19), at the ICU, in Rio de Janeiro, Brazil July 2, 2020.

Juan, 49, who recovered from the coronavirus disease (COVID-19) and whose father Jaime Florez, 80, died from the disease, poses for a photo as he holds a hat and the box containing Florez's ashes inside his apartment in Mexico City, Mexico September 11, 2020.

A pulse oximeter is seen placed on the finger of nurse Jorge Catarino, 35, during his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

Florentina Martin, a 99 year-old woman who survived coronavirus disease (COVID-19), plays a digital puzzle with her great-grandson Pedro Valle at her home in Pinto, near Madrid, Spain, October 20, 2020.

Renata Alfaia exercises at her house after recovering from the coronavirus disease (COVID-19), in Rio de Janeiro, Brazil, November 19, 2020.

Nurse Jorge Catarino, 35, performs aerobic exercise as part of his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

Ramon Fite, 67, a recovered COVID-19 patient, undergoes rehabilitation with a physical therapist at the Hospital Vall d'Hebron facility, a hastily converted sports centre, in Barcelona, Spain, June 10, 2020.

Recovered coronavirus patient Jeff Brink talks with blood collection specialist Lydia Rezene while donating convalescent plasma at the Central Seattle Donor Center of Bloodworks Northwest during the coronavirus disease (COVID-19) global outbreak, in Seattle, Washington, U.S. September 2, 2020.

Nurse Jorge Catarino, 35, holds a cube as part of his recovery therapy after suffering from the coronavirus disease (COVID-19) and being intubated for two weeks, at Physical Medicine and Rehabilitation Center of the Mexican Institute of Social Security (IMSS) in Mexico City, Mexico November 30, 2020.

A man reacts as he is being discharged from the hospital after surviving the coronavirus disease (COVID-19), at the San Rafael Hospital, as the coronavirus disease (COVID-19) outbreak continues, in Santa Tecla, El Salvador June 26, 2020.

Francisco Garcia, 31, who spent almost four months in hospital with coronavirus disease (COVID-19), recovers at his home in Los Angeles, California, U.S., August 19, 2020.

Sixty-seven-year-old Geoffrey Hurren, who survived a coronavirus infection, sits on banana boxes at the fruit and vegetable stall his family have been running for over 100 years at North End Road market following the outbreak of the coronavirus disease (COVID-19) in Fulham, London, Britain, November 28, 2020.

Grocery worker Jackie Mayoral, 55, (C), who survived COVID-19 pauses for a moment of silence in front of a Dia de los Muertos, Day of the Dead, altar honoring 1,308 UFCW Local 770 grocery, drug store, and food processing essential union workers who have died from the coronavirus disease (COVID-19), in Los Angeles, California, U.S., October 26, 2020.