A vaccine van transports the vaccine developed by Oxford/AstraZeneca from a regional vaccine store to various vaccination centres, during the coronavirus disease (COVID-19) pandemic, in Koraput, India, January 15, 2021. REUTERS/Danish Siddiqui

A van from Region Midtjylland (Central Jutland Region) health authorities disembarks the ferry on the remote island of Endelave in the sea of Kattegat, Denmark January 21, 2021. Ritzau Scanpix/Claus Fisker via REUTERS

Faith Walsh, a nurse with the United States Public Health Service, carries a cooler containing a single vial of Moderna (COVID-19) vaccine while en route to in Eagle, Alaska, U.S., March 31, 2021.

Healthcare workers walk down the hill after administering coronavirus disease (COVID-19) vaccines in the remote mountain village of Ljevista, Kolasin municipality, Montenegro, May 10, 2021.

A healthcare worker gives a dose of COVISHIELD, a coronavirus disease (COVID-19) vaccine manufactured by Serum Institute of India, to a shepherd man during a vaccination drive at a forest area in south Kashmir's

Municipal health workers travel on a boat along the Solimoes river banks, where Ribeirinhos (river dwellers) live, to administer the AstraZeneca/Oxford vaccine for the coronavirus disease (COVID-19) to the residents, in Manacapuru, Amazonas state, Brazil, February 1, 2021.

The Vacci'Bus, a bus converted into a coronavirus disease (COVID-19) consultation and vaccination center which travels through isolated villages near Reims to bring the Covid-19 vaccine to elderly people, drives on a road in Vandeuil, France, January 28, 2021.

Lino Cavalcante Mota receives the AstraZeneca/Oxford vaccine for the coronavirus disease (COVID-19) from a municipal health worker, along the Solimoes river banks, where Ribeirinhos (river dwellers) live, in Manacapuru, Amazonas state, Brazil, February 1, 2021.

Sgt Niall O'Connor hands boxes to Dr. Richard Quinn as they deliver Moderna vaccines against the coronavirus disease (COVID-19) by helicopter to Arranmore Island, Ireland March 11, 2021.

Healthcare workers and a Red Cross volunteer drive through the remote mountain region of Gornja Moraca during a coronavirus disease (COVID-19) vaccination campaign in Kolasin municipality, Montenegro, May 10, 2021.

Healthcare workers cross a stream to reach to a forest area to inoculate shepherds with a coronavirus disease (COVID-19) vaccine during a vaccination drive in south Kashmir's Pulwama district June 7, 2021.

Steve Robbins stops his sled dog team after mushing to help at a vaccination site in Eagle, Alaska, U.S., March 31, 2021.

Steve Robbins unhooks his sled dog team after mushing to a vaccination site to help, amid the coronavirus disease (COVID-19) pandemic, in Eagle, Alaska, U.S., March 31, 2021.

A porter carrying a box with COVISHIELD, a coronavirus disease (COVID-19) vaccine manufactured by Serum Institute of India, crosses a stream on a footbridge during a vaccination drive at Lidderwat near scenic Pahalgam in south Kashmir's Anantnag district, June 10, 2021.

A shepherd woman receives a dose of COVISHIELD, a coronavirus disease (COVID-19) vaccine manufactured by Serum Institute of India, during a vaccination drive at Lidderwat near scenic Pahalgam in south Kashmir's Anantnag district, June 10, 2021.

A man receives a dose of Sputnik V (Gam-COVID-Vac) vaccine against the coronavirus disease (COVID-19) in a carriage of the Academician Fyodor UglovA medical train, at a railway station in the town of Tulun in Irkutsk Region, Russia March 16, 2021.

Healthcare workers prepare to administer the coronavirus disease (COVID-19) vaccine to an elderly woman in her hut in the remote mountain village of Redice, Kolasin municipality, Montenegro, May 10, 2021.

A driver of the van from Region Midtjylland (Central Jutland Region) health authorities sits on board the ferry to the remote island of Endelave in the sea of Kattegat, Denmark January 21, 2021. Ritzau Scanpix/Claus Fisker via REUTERS

RN Erika Williams vaccinates farmworker Francisco Felix as health professions come out to the farming community to deliver vaccinations during the outbreak of the coronavirus disease (COVID-19) in Mecca, California, U.S., February 1, 2021.

The lighthouse of Arranmore Island is pictured from the helicopter where Moderna vaccines against the coronavirus disease (COVID-19) were transported to Arranmore Island, Ireland, March 11, 2021.

Manitoba-based truckers, transporting goods to and from the United States, are being vaccinated against coronavirus disease (COVID-19) as part of a deal between the Canadian province and the state of North Dakota, at a rest stop near Drayton, North Dakota, U.S. April 22, 2021.

Healthcare workers head to a hut to inoculate shepherds during a COVID-19 vaccination drive at a forest area in south Kashmir's Pulwama district June 7, 2021.

Healthcare workers trek to inoculate shepherds with COVISHIELD, a coronavirus disease (COVID-19) vaccine manufactured by Serum Institute of India, during a vaccination drive at Lidderwat near scenic Pahalgam in south Kashmir's Anantnag district, June 10, 2021.

Senior citizens, wearing protective face masks, wait outside the Vacci'Bus, a bus converted into a coronavirus disease (COVID-19) consultation and vaccination center which travels through isolated villages near Reims to bring the Covid-19 vaccine to elderly people, in Pevy, France, January 28, 2021.

A firefighter administers a dose of the Pfizer BioNTech Covid-19 vaccine to an elderly patient in the Vacci'Bus, a bus converted into a coronavirus disease (COVID-19) consultation and vaccination center which travels through isolated villages near Reims to bring the Covid-19 vaccine to local residents, in Pevy, France, January 28, 2021.

Health professionals come out to the farming community to deliver vaccinations during the outbreak of the coronavirus disease (COVID-19) in Mecca, California, U.S., February 1, 2021.

Sgt Niall O'Connor guides the helicopter down to land as Moderna coronavirus disease (COVID-19) vaccines are delivered to Arranmore Island, Ireland March 11, 2021.

Steve Robbins leads his sled dog team across a frozen lake after helping at a vaccination site in Eagle, Alaska, U.S., March 31, 2021. Picture taken with a drone on March 31, 2021.

Municipal health workers and environmental military police officer leave the Sustainable Development Reserve of Tupe after administering the AstraZeneca/Oxford vaccine in the Negro river banks in Manaus, Brazil, February 9, 2021.