Office workers scan a Safe Entry QR code to enter a mall, amid the coronavirus disease (COVID-19) outbreak in Singapore May 12, 2021. REUTERS/Dawn Chua

An Italian tourist scans a QR code to buy online a ticket to visit the leaning tower of Pisa as it re-opens to the public, following the ease of restrictions to curb the spread of the coronavirus disease (COVID-19), in Pisa, Italy, May 1, 2021. REUTERS/Jennifer Lorenzini

The Codecov logo and cyber binary codes are seen in this illustration taken April 20, 2021. REUTERS/Dado Ruvic/Illustration

Small toy figures are seen in front of the Codecov logo and cyber binary codes in this illustration taken April 20, 2021. REUTERS/Dado Ruvic/Illustration

The Ivanti logo and cyber binary codes are seen in this illustration taken April 20, 2021. REUTERS/Dado Ruvic/Illustration

Small toy figures are seen in front of the Ivanti logo as cyber binary codes are seen in the background in this illustration taken April 20, 2021. REUTERS/Dado Ruvic/Illustration

A woman wearing a face mask scans a QR-code to check her turn to take a train at Constitucion train station, amid a rise in cases of the coronavirus disease (COVID-19), in Buenos Aires, Argentina April 8, 2021. REUTERS/Agustin Marcarian

Registration papers or the alternative QR-code for the so-called LUCA mobile phone application for a one-day shopping pass following a negative COVID-19 rapid test are pictured outside a store, as the spread of the coronavirus disease (COVID-19) continues in Weimar, Germany, March 29, 2021. REUTERS/Karina Hessland

Registration papers or the alternative QR-code for the so-called LUCA mobile phone application for a one-day shopping pass following a negative COVID-19 rapid test are pictured outside a store, as the spread of the coronavirus disease (COVID-19) continues in Weimar, Germany, March 29, 2021. REUTERS/Karina Hessland

A woman shows her QR-code of the so-called LUCA mobile phone application after being tested at a COVID-19 rapid test centre for a day pass to visit shops and cultural institutions, as the spread of the coronavirus disease (COVID-19) continues in Weimar, Germany, March 29, 2021. REUTERS/Karina Hessland

A volunteer scans the QR code on the wristband of a man at the entrance of the sports arena Max-Schmeling-Halle before a play-off game between the Volleys Berlin and Dueren as part of a Berliner sport pilot project amid the coronavirus disease (COVID-19) outbreak in Berlin, Germany, March 24, 2021. REUTERS/Annegret Hilse

A worker of the COVID-19 test centre puts a wristband with a QR code on a person before entering the sports arena Max-Schmeling-Halle for a play-off game between the Volleys Berlin and Dueren as part of a Berliner sport pilot project amid the coronavirus disease (COVID-19) outbreak in Berlin, Germany, March 24, 2021. REUTERS/Annegret Hilse

Abortion rights activists sit outside tents set up in front of the National Palace during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

An abortion rights activist gathers things next to tents set up in front of the National Palace during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

An Abortion rights activist holds a plastic medallion reading "For the #3Causales (#3LegalGrounds), Life, Health and Dignity" during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

Tents of abortion rights activists are set up in front of the National Palace during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

Abortion rights activists sit outside tents set up in front of the National Palace during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

Abortion rights activists sit outside tents set up in front of the National Palace during a protest to pressure parliament over a proposed reform to the penal code that could end the total ban on abortion, in Santo Domingo, Dominican Republic March 18, 2021. REUTERS/Ricardo Rojas

An elderly resident shows his mobile registration code to a health worker to receive his first dose of the coronavirus disease (COVID-19) vaccine, as the government started vaccination for the general public, starting with elderly people, at a vaccination center in Karachi, Pakistan March 10, 2021. REUTERS/Akhtar Soomro

A costumer scans a QR-code by mobile phone before getting acces to a fashion store as the coronavirus disease (COVID-19) lockdown measures are eased in in Dresden, Germany, March 9, 2021. REUTERS/Matthias Rietschel

Costumers scan a QR-code by mobile phone before getting acces to a fashion store as the coronavirus disease (COVID-19) lockdown measures are eased in in Dresden, Germany, March 9, 2021. REUTERS/Matthias Rietschel

A costumer scans a QR-code by mobile phone before getting acces to a fashion store as the coronavirus disease (COVID-19) lockdown measures are eased in in Dresden, Germany, March 9, 2021. REUTERS/Matthias Rietschel

A woman uses a smartphone to scan a QR code for the registration for a COVID-19 quick test at Carl-von-Ossietzky School, amid the coronavirus disease (COVID-19) pandemic, in Berlin, Germany, March 8, 2021. REUTERS/Annegret Hilse

A customer scans a QR code to enter at the UK's first Amazon Fresh supermarket, in London, Britain March 4, 2021. REUTERS/Henry Nicholls

A customer scans a QR code to enter at the UK's first Amazon Fresh supermarket, in London, Britain March 4, 2021. REUTERS/Henry Nicholls

A QR code device is seen at the entrance of the UK's first Amazon Fresh supermarket, in London, Britain March 4, 2021. REUTERS/Henry Nicholls

A woman scans a QR code to enter at the UK's first Amazon Fresh supermarket, in London, Britain March 4, 2021. REUTERS/Henry Nicholls

A staff member holds a QR code for the "LeaveHomeSafe" COVID-19 contact-tracing app to consumers at a restaurant, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 18, 2021. REUTERS/Tyrone Siu

QR codes for the "LeaveHomeSafe" COVID-19 contact-tracing app are posted at a restaurant, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 18, 2021. REUTERS/Tyrone Siu

Consumers scan QR codes for the "LeaveHomeSafe" COVID-19 contact-tracing app at a restaurant, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 18, 2021. REUTERS/Tyrone Siu

A staff member holds a QR code for the "LeaveHomeSafe" COVID-19 contact-tracing app to consumers at a restaurant, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 18, 2021. REUTERS/Tyrone Siu

A QR code for the "LeaveHomeSafe" COVID-19 contact-tracing app is posted at a shopping mall, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 16, 2021. REUTERS/Tyrone Siu

A QR code for the "LeaveHomeSafe" COVID-19 contact-tracing app is posted at a shopping mall, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 16, 2021. REUTERS/Tyrone Siu

A QR code for the "LeaveHomeSafe" Covid-19 contact-tracing app is posted during Lunar New Year fair at Victoria Park, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 11, 2021. REUTERS/Tyrone Siu

A QR code for the "LeaveHomeSafe" Covid-19 contact-tracing app is posted during Lunar New Year fair at Victoria Park, following the coronavirus disease (COVID-19) outbreak, in Hong Kong, China February 11, 2021. REUTERS/Tyrone Siu

A mock sample of a QR-coded vaccination pass that will be distributed to all people that receive the vaccine against the coronavirus disease (COVID-19) is pictured in the eastern Bavarian district of Altoetting, Germany February 5, 2021. REUTERS/Marcus Nagle

A mock sample of a QR-coded vaccination pass that will be distributed to all people that receive the vaccine against the coronavirus disease (COVID-19) is pictured in the eastern Bavarian district of Altoetting, Germany February 5, 2021. REUTERS/Marcus Nagle

A mock sample of a QR-coded vaccination pass that will be distributed to all people that receive the vaccine against the coronavirus disease (COVID-19) is pictured in the eastern Bavarian district of Altoetting, Germany February 5, 2021. REUTERS/Marcus Nagle

A chart indicating colour coding systems for different oxygen delivery percentages is seen on a wall in the HDU (High Dependency Unit) at Milton Keynes University Hospital, amid the spread of the coronavirus disease (COVID-19) pandemic, Milton Keynes, Britain, January 20, 2021. Picture taken January 20, 2021. REUTERS/Toby Melville

A screenshot obtained January 20, 2021, shows HTML code on https://www.whitehouse.gov/ containing an invitation to join the U.S. Digital Service, a technology unit within the White House. REUTERS

People show their health code to a man guarding an entry checkpoint of a market as they register their visit, following the new outbreak of the coronavirus disease (COVID-19), in Beijing, China January 15, 2021. REUTERS/Tingshu Wang

A woman scans a health QR code on her smartphone to register her visit to a market before crossing the entry checkpoint, following the new outbreak of the coronavirus disease (COVID-19), in Beijing, China January 15, 2021. REUTERS/Tingshu Wang

People show their health code to a man guarding an entry checkpoint of a market as they register their visit, following the new outbreak of the coronavirus disease (COVID-19), in Beijing, China January 15, 2021. REUTERS/Tingshu Wang

A QR code for passengers to register health information is seen on a plastic shield inside a ride-hailing vehicle, following the coronavirus disease (COVID-19) outbreak in Beijing, China January 14, 2021. REUTERS/Florence Lo

A taxi driver shows a QR code of health registration for a passenger to scan before a ride, following new cases of the coronavirus disease (COVID-19) in the country, in Beijing, China January 11, 2021. REUTERS/Tingshu Wang

People scan a QR code for checking health condition as they enter a market, following new cases of the coronavirus disease (COVID-19) in the country, in Beijing, China January 11, 2021. REUTERS/Tingshu Wang

QR code of the electronic payment service Alipay that belongs to Ant Group Co Ltd is seen at a market stall in Beijing, China, December 31, 2020. REUTERS/Thomas Peter

Customer uses a phone to scan the QR code of the electronic payment service Alipay that belongs to Ant Group Co Ltd at a market stall in Beijing, China, December 31, 2020. REUTERS/Thomas Peter

A security guard directs people to scan a QR code to track their health status before entering a shopping complex, following the new cases of the coronavirus disease (COVID-19) in Beijing, China December 25, 2020. REUTERS/Tingshu Wang

A military aide carries the nuclear launch codes into the White House, after U.S. President Donald Trump arrived from travel to West Point, New York, on the South Lawn in Washington, U.S., December 12, 2020. REUTERS/Cheriss May

A volunteer writes a confirmation code during a popular consultation launched by opposition leader Juan Guaido to reject Venezuela's December 6 parliamentary election, in Doral, Florida, U.S., December 12, 2020. REUTERS/Marco Bello

A man shows a code confirming his digital vote at a voting center for the popular consultation meant to reject December 6 parliamentary election in Caracas, Venezuela December 12, 2020. REUTERS/Manaure Quintero

The mutations that give rise to new strains occur when the SARS-CoV-2 virus makes copies of itself inside a new host. The virus’ genome is a complete set of genetic instructions that is written in 30,000 “letters” of code.

Customers register before entering the restaurant Comedor de los Milagros after the city government implemented a QR-code registration system to prevent novel coronavirus spread in Mexico City, Mexico November 25, 2020. REUTERS/Henry Romero

Customers register before entering the restaurant Comedor de los Milagros after the city government implemented a QR-code registration system to prevent novel coronavirus spread in Mexico City, Mexico November 25, 2020. REUTERS/Henry Romero

A man wearing a face mask walks past signs of the "LeaveHomeSafe" mobile app, a QR health code system to track people's health status amid the coronavirus disease (COVID-19) outbreak, at a building in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

A sign introducing the "LeaveHomeSafe" mobile app, a QR health code system to track people's health status amid the coronavirus disease (COVID-19) outbreak, is seen on a notice board at a building in Hong Kong, China November 25, 2020. REUTERS/Lam Yik

Travellers scan a QR code to track their itinerary history at Beijing Capital International Airport, following the global outbreak of the coronavirus disease (COVID-19), in Beijing, China November 22, 2020. REUTERS/Tingshu Wang

A QR code is seen before a funeral service with social distancing measures due to the coronavirus disease (COVID-19) outbreak, at St Mary's Church in Milton Keynes, Britain, November 18, 2020. REUTERS/Andrew Boyers

A Code Enforcement officer removes a U.S. President Donald Trump and Vice President Mike Pence campaign sign from the entrance of a polling station during the 2020 U.S. presidential election in Palm Beach, Florida, U.S., November 3, 2020. REUTERS/Marco Bello