A view of a medical facility at a correctional and rehabilitation centre during a government-guided tour for the media, in Badr City, on the outskirts of Cairo, Egypt, December 30, 2021. Picture taken December 30, 2021. REUTERS/Staff 

A view shows vials containing Russian-made vaccines against the coronavirus disease (COVID-19) during a demonstration at a regional clinical medical and rehabilitation centre in Tver, Russia May 24, 2021. Vials contain vaccines Gam-COVID-Vac or Sputnik-V developed by the Gamaleya National Center of Epidemiology and Microbiology, CoviVac produced by the Chumakov Centre and EpiVacCorona made by Vector State Research Centre of Virology and Biotechnology. REUTERS/Tatyana Makeyeva 

A view shows vials containing Russian-made vaccines against the coronavirus disease (COVID-19) during a demonstration at a regional clinical medical and rehabilitation centre in Tver, Russia May 24, 2021. Vials contain vaccines Gam-COVID-Vac or Sputnik-V developed by the Gamaleya National Center of Epidemiology and Microbiology, CoviVac produced by the Chumakov Centre and EpiVacCorona made by Vector State Research Centre of Virology and Biotechnology. REUTERS/Tatyana Makeyeva 

Patients of a centre providing medical, rehabilitation and nursing care to elderly people hold candles during the Holy Fire ceremony on the eve of Orthodox Easter in Stavropol, Russia May 1, 2021. REUTERS/Eduard Korniyenko 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) exercises in a swimming pool at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

Patients recovering from the coronavirus disease (COVID-19) are treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A healthcare worker treats a patient recovering from the coronavirus disease (COVID-19) at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A healthcare worker treats a patient recovering from the coronavirus disease (COVID-19) at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

A patient recovering from the coronavirus disease (COVID-19) is treated at the Casciana thermal baths spa, which has opened as a rehabilitation centre using its thermal water as part of treatment to help with respiratory difficulties, in Pisa, Italy, February 23, 2021. REUTERS/Jennifer Lorenzini 

Yannis Ieremias, 70, is assisted to sit on a robotic-assisted hand therapy device at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, rests during a physiotherapy session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, is assisted to sit on a robotic-assisted hand therapy device at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, is assisted to walk by physiotherapist Georgia Bahou at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, is assisted by physiotherapist Georgia Bahou at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, is assisted by physiotherapist Georgia Bahou to keep his balance while walking during a session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, rests in his room at the Theseus Rehabilitation Centre in Athens, Greece, February 10, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 10, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, rests during a physiotherapy session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, rests during a physiotherapy session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, is silhouetted while holding an exercise ball during a physiotherapy session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, holds his walking stick during a session with physiotherapist Georgia Bahou at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, exercises with physiotherapist Georgia Bahou during a session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, sits on a wheelchair during a physiotherapy session at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, and physiotherapist Georgia Bahou enter the elevator following a session at the Theseus Rehabilitation Centre in Athens, Greece, February 2, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 2, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, looks on during an interview with Reuters at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

Yannis Ieremias, 70, holds an exercise ball during a session with physiotherapist Georgia Bahou at the Theseus Rehabilitation Centre in Athens, Greece, February 1, 2021. Ieremias, who spend more than 50 days in the intensive care unit of an Athens hospital with the coronavirus disease (COVID-19), must undergo therapy to recover from mobility problems caused by his extend hospitalisation. Picture taken February 1, 2021. REUTERS/Alkis Konstantinidis 

A medical worker prepares a dose of AstraZeneca's COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca's COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A box AstraZeneca COVID-19 vaccines is seen at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A box AstraZeneca COVID-19 vaccines is seen at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca's COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca's COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical staff member receives a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical staff member receives a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical staff member receives a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical staff member receives a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

Medical team workers are seen near a placard reading "I am in favor of the COVID-19 vaccine" at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A person waits near a placard reading "I am in favor of the COVID-19 vaccine" after receiving a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A person waits near a placard reading "I am in favor of the COVID-19 vaccine" after receiving a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A person waits near a placard reading "I am in favor of the COVID-19 vaccine" after receiving a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca's COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman 

A medical worker prepares a dose of AstraZeneca COVID-19 vaccine at the Neurological and Functional Rehabilitation Centre of the CHU hospital, amid the spread of the coronavirus disease (COVID-19), in Fraiture, Belgium February 12, 2021. REUTERS/Yves Herman