Medical workers are seen at a vaccination site against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

Medical workers are seen at a vaccination site against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

A general view shows a vaccination site for the coronavirus disease (COVID-19) at a sports stadium during a vaccination session for elderly people over 85 years old, in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

A general view shows a vaccination site for the coronavirus disease (COVID-19) at a sports stadium during a vaccination session for elderly people over 85 years old, in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

People receive a vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

People wait at the observation area after receiving the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

People receive the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker administers a dose of the AstraZeneca vaccine against the coronavirus disease (COVID-19) for a man during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

A man waits at the observation area after receiving the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker administers a dose of the AstraZeneca vaccine against the coronavirus disease (COVID-19) for a man during a vaccination session for elderly people over 85 years old, at a sports stadium in New Taipei City, Taiwan June 15, 2021. REUTERS/Ann Wang

People wait during a vaccination session for elderly people over 85 years old at a school following the coronavirus disease (COVID-19) outbreak in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

People wait during a vaccination session for elderly people over 85 years old at a school following the coronavirus disease (COVID-19) outbreak in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

Medical workers work on administering the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a school in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker administers a dose of the vaccine against the coronavirus disease (COVID-19) for a man during a vaccination session for elderly people over 85 years old, at a school in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker checks on a woman at an observation area for those who have received the vaccine against the coronavirus disease (COVID-19), during a vaccination session for elderly people over 85 years old, at a school in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker administers a dose of the vaccine against the coronavirus disease (COVID-19) for a woman during a vaccination session for elderly people over 85 years old, at a school in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

People wait at the observation area after receiving the vaccine against the coronavirus disease (COVID-19), during a vaccination session for elderly people over 85 years old, at a school in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

People line up to receive the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker administers a dose of the vaccine against the coronavirus disease (COVID-19) for a woman during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

People line up to receive the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

Bottles of the AstraZeneca vaccine against the coronavirus disease (COVID-19) are seen during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

People practise social distancing as they line up to receive the vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

Medical workers prepare doses of the AstraZeneca vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

A medical worker prepares a dose of the AstraZeneca vaccine against the coronavirus disease (COVID-19) during a vaccination session for elderly people over 85 years old, at a church in Taipei, Taiwan June 15, 2021. REUTERS/Ann Wang

Portraits of sumo champions hang at the entrance of a gymnasium turned into a mass vaccination centre for the elderly in Soma, Fukushima Prefecture, Japan June 9, 2021. Picture taken June 9, 2021. REUTERS/Rocky Swift

A gymnasium which turned into a mass vaccination centre for the elderly is pictured in Soma, Fukushima Prefecture, Japan, June 9, 2021. Picture taken June 9, 2021. REUTERS/Rocky Swift

Local government workers aid a handicapped elderly women on a street outside the Regional Government Health Corporation turned into a mass vaccination centre to receive their first dose of Russia's Sputnik V vaccine against the coronavirus disease (COVID-19), in Maracay, Venezuela June 8, 2021. Picture taken June 8, 2021. REUTERS/Leonardo Fernandez Viloria

Humanoid robot Grace, developed by Hanson Robotics and designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, is seen at the company's lab in Hong Kong, China June 8, 2021. REUTERS/Joyce Zhou

Humanoid robot Grace, developed by Hanson Robotics, designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, has her lips painted at the company's lab in Hong Kong, China June 8, 2021. REUTERS/Joyce Zhou

Humanoid robot Grace, developed by Hanson Robotics and designed for the healthcare market to interact and comfort the elderly and isolated people, especially those suffering during the coronavirus disease (COVID-19) pandemic, is seen at the company's lab in Hong Kong, China June 8, 2021. Picture taken June 8. REUTERS/Joyce Zhou

An elderly woman wearing a protective face mask against COVID-19, leaves after receiving vaccine against the coronavirus disease (COVID-19) at a mass immunization venue inside Cairo's International Exhibition Center in Cairo, Egypt June 5, 2021. REUTERS/Amr Abdallah Dalsh

An elderly woman arrives to receive vaccine against the coronavirus disease (COVID-19) at a mass immunization venue inside Cairo's International Exhibition Center in Cairo, Egypt June 2, 2021. REUTERS/Amr Abdallah Dalsh

An elderly man receives a dose of China's Sinopharm vaccine against the coronavirus disease (COVID-19) at a mass immunization venue inside Cairo's International Exhibition Center in Cairo, Egypt June 2, 2021. REUTERS/Amr Abdallah Dalsh

An elderly couple cross Bayard Street near the site of the May 31, 2021 unprovoked attack on an Asian person, a 55 year old woman, in Manhattan's Chinatown district in New York City, U.S. June 2, 2021. REUTERS/Mike Segar

An asylum-seeking migrant man from Venezuela carries an elderly woman as he walks in the water to cross the Rio Grande river into the United States from Mexico in Del Rio, Texas, U.S., May 26, 2021. REUTERS/Go Nakamura

An asylum-seeking migrant man from Venezuela carries an elderly woman as he walks in the water to cross the Rio Grande river into the United States from Mexico in Del Rio, Texas, U.S., May 26, 2021. REUTERS/Go Nakamura TPX IMAGES OF THE DAY

An U.S. Border Patrol agent and an asylum-seeking migrant man carry an elderly migrant woman from Venezuela after crossing the Rio Grande river into the United States from Mexico in Del Rio, Texas, U.S., May 26, 2021. REUTERS/Go Nakamura

An U.S. Border Patrol agent assists an elderly asylum-seeking migrant woman from Venezuela after the woman crossed the Rio Grande river into the United States from Mexico in Del Rio, Texas, U.S., May 26, 2021. REUTERS/Go Nakamura

An U.S. Border Patrol agent assists an elderly asylum-seeking migrant woman from Venezuela after the woman crossed the Rio Grande river into the United States from Mexico in Del Rio, Texas, U.S., May 26, 2021. REUTERS/Go Nakamura

An Israeli woman offers flowers to an elderly by a shopping centre in Ashkelon following Israel-Hamas truce, in Ashkelon, Israel May 21, 2021. REUTERS/Ronen Zvulun

A health worker prepares to inoculate an elderly woman with asthma with Sinovac Biotech's CoronaVac vaccine against the coronavirus disease (COVID-19) during a house to house vaccination, in Manila, Philippines, May 21, 2021. REUTERS/Lisa Marie David

Coronavirus disease (COVID-19) rapid test devices are seen as visitors of the "Emilia senior residence" elderly care are tested, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

View of the entrance to the flat of a resident of the "Emilia senior residence" elderly care, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

View of the resident's door of the "Emilia senior residence" elderly care, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A visitors of the "Emilia senior residence" elderly care gets tested as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A resident of the "Emilia senior residence" elderly care gets his blood pressure measured as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A resident of the "Emilia senior residence" elderly care plays a game as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A resident of the "Emilia senior residence" elderly care returns from lunch as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A resident of the "Emilia senior residence" elderly care returns from lunch as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

View of the entrance of the "Emilia senior residence" elderly care as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A care taker holds the hand of a resident of the "Emilia senior residence" elderly care prior to their lunch as the spread of the coronavirus disease (COVID-19) continues in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A resident of the "Emilia senior residence" elderly care pets dog Emma, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

Residents of the "Emilia senior residence" elderly care play a game as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

Christiane Schmidt, a daily-life care taker at the "Emilia senior residence" elderly care, presents their newly built market cart, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A sign with a saying by Ernest Hemingway reading "The older you get, the more difficult it becomes to have heroes, but that is exactly what is necessary" is seen at the gates of the "Emilia senior residence" elderly care, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

Christiane Schmidt, a daily-life care taker at the "Emilia senior residence" elderly care, presents their newly built market cart, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A care taker changes beddings for residents of the "Emilia senior residence" elderly care, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A care taker talks to a resident of the "Emilia senior residence" elderly care prior to their lunch as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

A care taker feeds a resident of the "Emilia senior residence" elderly care, as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach

Residents of the "Emilia senior residence" elderly care have lunch together on their way "back to normal", as the spread of the coronavirus disease (COVID-19) continues, in Darmstadt, Germany, May 18, 2021. REUTERS/Kai Pfaffenbach