James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

James Hyslop, Head of Scientific Instruments, Globes and Natural History at Christie's, demonstrates the Darwin Family Microscope, owned and used by the English naturalist and founder of the concept of evolution, Charles Darwin, which will be offered at auction as part of Christie's Classic Week, London, Britain, October 14, 2021. Picture taken October 14. REUTERS/Toby Melville

L'évolution de l'iPod d'Apple depuis 2001

Evolution of Apple's iPod since 2001.

Graphique montrant l'évolution en pourcentage en Chine, d'une année sur l'autre, de l'investissement immobilier, des ventes de biens immobiliers et des nouvelle constructions.

Évolution des températures annuelles moyennes à la surface de la Terre et des précipitations.

Évolution des la moyenne de minutes consacrées par jour à une sélection d’activités entre mai et décembre 2020, par rapport à 2019.

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Cast members Goya Rego and Padme Hamdemir pose. REUTERS/Johanna Geron

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Cast members Goya Rego and Padme Hamdemir pose. REUTERS/Johanna Geron

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Cast members Goya Rego and Padme Hamdemir pose. REUTERS/Johanna Geron

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Director Kornel Mundruczo, cast member and Kata Weber pose. REUTERS/Johanna Geron

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Director Kornel Mundruczo, cast members Padme Hamdemir, Annamaria Lang and Kata Weber pose. REUTERS/Johanna Geron

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Director Kornel Mundruczo, cast members Padme Hamdemir, Annamaria Lang and Kata Weber pose. REUTERS/Eric Gaillard

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Cast member Goya Rego poses. REUTERS/Eric Gaillard

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Cast member Padme Hamdemir poses. REUTERS/Eric Gaillard

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Director Kornel Mundruczo, cast member and Kata Weber pose. REUTERS/Eric Gaillard

The 74th Cannes Film Festival - Photocall for the film "Evolution" presented as part of Cannes Premiere - Cannes, France, July 12, 2021. Director Kornel Mundruczo poses. REUTERS/Eric Gaillard

Évolution de cinq mesures clés depuis décembre

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.

Le coronavirus SARS-CoV-2 a muté en sept grands groupes, ou souches, en s’adaptant à ses hôtes humains.

Reuters analysed over 185,000 genome samples from GISAID, the largest database of novel coronavirus genome sequences in the world, to show how the regional dominance of major strains has shifted over time.

The GISAID data mapped out about 3,500 of the coronavirus samples from all over the world, that shows how they are related. A visualisation of the data illustrates the relationships among the samples and where new strains emerged.

Chart showing the strains of the novel coronavirus present in 185,000 virus samples.

CORRECTION A previous version of this graphic incorrectly stated that Wuhan is a province in China. The world is now dealing with a different type of SARS-CoV-2 than the one that emerged in China almost a year ago, with mutations creating at least seven strains of the virus so far.

People wait for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares

A nurse takes a blood sample from a man for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares

A nurse takes a blood sample from a woman for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares TPX IMAGES OF THE DAY

People wait for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares

A nurse takes a blood sample from a woman for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares

People wait for a coronavirus disease (COVID-19) test with the help of 'Dados do Bem' app, developed by doctors and scientists to use data information to analyze the evolution of population immunity, at the Santa Marta slum in Rio de Janeiro, Brazil October 9, 2020. REUTERS/Pilar Olivares

Graphique montrant l'évolution de la fumée dégagée par les incendies de la côte ouest aux Etats-Unis

Le graphique montre la population âgée par pays et la projection de son évolution.

Graphic shows the evolution of the Baodi Mall cluster of COVID-19 infections, in Tianjin, China.

A look at the history of sports at the summer Olympics

A look at the history of sports at the summer Olympics (En francais)

Las compañías predecesoras de Juul, Ploom Inc y Pax Labs, lanzaron varios dispositivos de vapeo antes del cigarrillo electrónico Juul.

Juul’s predecessor companies, Ploom Inc and Pax Labs, released several vaping devices before the Juul e-cigarette.

Kevin Crowder helps his son Elias Crowder create a Pan African flag at the American Evolution 2019 Commemoration, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

African dancers take part in the American Evolution 2019 Commemoration ceremony, marking the 400 year anniversary of the arrival of the first enslaved Africans, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

African dancers take part in the American Evolution 2019 Commemoration ceremony, marking the 400 year anniversary of the arrival of the first enslaved Africans, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

African dancers celebrate at the American Evolution 2019 Commemoration ceremony, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

U.S. Rep. (D-MO) William Lacy Clay applauds during first African slave landings anniversary ceremony presented by American Evolution - 2019 Commemoration and Fort Monroe Authority in partnership with the National Park Service and the City of Hampton, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

Members of the community participate in the 2019 African Landing Commemorative American Evolution and Fort Monroe Authority in partnership with the National Park Service and the City of Hampton, in Hampton, Virginia, U.S., August 24, 2019. REUTERS/Michael A. McCoy

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls

People interact with Olafur Eliasson's 'The cubic structural evolution project 2004', which consists of one tonne of white Lego bricks, at the Tate Modern's Turbine Hall in London, Britain July 26, 2019. REUTERS/Henry Nicholls