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.

Assaf Fassy, Digital Services Manager for Shem Olam Holocaust Memorial Centre, looks at their digital photo database at their offices in Kfar Haroeh, Israel January 14, 2020. Picture taken January 14, 2020. REUTERS/Ronen Zvulun

School teacher, Nancy Gbamoi, smiles outside a hotel, after becoming the first person in the country to apply for an online ID database in credit system, in Freetown, Sierra Leone August 21, 2019. REUTERS/Cooper Inveen

Sierra Leone's President Julius Maada Bio speaks during the launching of an online ID database, designed by Kiva, that uses biometric data and blockchain technology to log citizens' credit histories in Freetown, Sierra Leone August 21, 2019. REUTERS/Cooper Inveen

Schan Duff, Vice President of Strategy for Kiva, a San Francisco-based tech charity that is using blockchain to create an online ID database in Sierra Leone allowing people who struggle to get loans to prove their credit history, speaks during the launching of the system in Freetown, Sierra Leone August 21, 2019. REUTERS/Cooper Inveen

Afghan election workers wait for vote-count papers of the parliamentary election, at the database center of Afghanistan Independent Election Commission in Kabul, Afghanistan October 24, 2018.REUTERS/Omar Sobhani

Afghan election workers wait for vote-count papers of the parliamentary election, at the database center of Afghanistan Independent Election Commission in Kabul, Afghanistan October 24, 2018.REUTERS/Omar Sobhani

Afghan election workers wait for vote-count papers of the parliamentary election, at the database center of Afghanistan Independent Election Commission in Kabul, Afghanistan October 24, 2018.REUTERS/Omar Sobhani

Afghan election workers wait for vote-count papers of the parliamentary election, at the database center of Afghanistan Independent Election Commission in Kabul, Afghanistan October 24, 2018.REUTERS/Omar Sobhani

Binders and boxes store the large database of black lung cases and histories gathered by Dr. Brandon Crum at United Medical Group in Pikeville, Kentucky, U.S., May 22, 2018. Dr. Crum, a fourth generation coal miner whose family members still mine coal, is the radiologist who first noticed the massive number of x-rays of complicated black lung in the region and his black lung disease database tracks variables such as which vein miners worked, and the type of job they did. REUTERS/Brian Snyder SEARCH "BLACK LUNG" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

The World Health Organisation developed a database on current abortion policies to increase transparency and help prevent unsafe abortions. embed code and instructions: https://reut.rs/2LsctcK

A man goes through the process of eye scanning for the Unique Identification (UID) database system, also known as Aadhaar, at a registration centre in New Delhi, India, January 17, 2018. Picture taken January 17, 2018. REUTERS/Saumya Khandelwal

A woman waits for her turn to to enrol for the Unique Identification (UID) database system, also known as Aadhaar, at a registration centre in New Delhi, India, January 17, 2018. Picture taken January 17, 2018. REUTERS/Saumya Khandelwal

A girl waits for her turn to enrol for the Unique Identification (UID) database system, also known as Aadhaar, at a registration centre in New Delhi, India, January 17, 2018. Picture taken January 17, 2018. REUTERS/Saumya Khandelwal

A woman goes through the process of finger scanning for the Unique Identification (UID) database system, also known as Aadhaar, at a registration centre in New Delhi, India, January 17, 2018. Picture taken January 17, 2018. REUTERS/Saumya Khandelwal

A man goes through the process of eye scanning for the Unique Identification (UID) database system, also known as Aadhaar, at a registration centre in New Delhi, India, January 17, 2018. Picture taken January 17, 2018. REUTERS/Saumya Khandelwal

USA-TASER/ - Explore Reuters’ database of more than 1,000 incidents in which people died after police stunned them with Tasers, often in conjunction with other force.

Exploration of incidents in which people died after police stunned them with Tasers

India's Prime Minister Narendra Modi looks on before launching a digital payment app linked with a nationwide biometric database during the "DigiDhan" fair, in New Delhi, India, December 30, 2016. REUTERS/Adnan Abidi

India's Prime Minister Narendra Modi looks on before launching a digital payment app linked with a nationwide biometric database during the "DigiDhan" fair, in New Delhi, India, December 30, 2016. REUTERS/Adnan Abidi

India's Prime Minister Narendra Modi arrives to launch a digital payment app linked with a nationwide biometric database during the "DigiDhan" fair, in New Delhi, India, December 30, 2016. REUTERS/Adnan Abidi

A veterinarian from a wildlife protection department scans a microchip of a tiger to collect wildlife database in a bid to tackle illegal wildlife trade at the Sriracha Tiger Zoo, in Chonburi province, Thailand October 6, 2016. REUTERS/Chaiwat Subprasom

Zoo workers and a veterinarian from wildlife protection department carry a tiger to collect wildlife database in a bid to tackle illegal wildlife trade at the Sriracha Tiger Zoo, in Chonburi province, Thailand October 6, 2016. REUTERS/Chaiwat Subprasom

Aryballe Technologies CEO Tristan Rousselle poses after showing a prototype of NeOse, a universal portable odour detection device connected to a database, in Paris, April 20, 2016. REUTERS/Christian Hartmann

Aryballe Technologies CEO Tristan Rousselle shows a prototype of NeOse, a universal portable odour detection device connected to a database on a mobile phone, in Paris, April 20, 2016. REUTERS/Christian Hartmann

Aryballe Technologies CEO Tristan Rousselle shows a prototype of NeOse, a universal portable odour detection device connected to a database on a mobile phone, in Paris, April 20, 2016. REUTERS/Christian Hartmann

Aryballe Technologies CEO Tristan Rousselle shows a prototype of NeOse, a universal portable odour detection device connected to a database on a mobile phone, in Paris, April 20, 2016. REUTERS/Christian Hartmann

Aryballe Technologies CEO Tristan Rousselle shows a prototype of NeOse, a universal portable odour detection device connected to a database on a mobile phone, in Paris, April 20, 2016. REUTERS/Christian Hartmann

A security officer stands guard at an entrance of Mossack Fonseca law firm office in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

A car passes by outside the Arango Orillac Building at which Mossack Fonseca law firm office is located, in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

A company list showing the Mossack Fonseca law firm is pictured outside the Arango Orillac Building in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

A taxi pass a company list showing the Mossack Fonseca law firm at the Arango Orillac Building in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

A man walks past a company list showing the Mossack Fonseca law firm at the Arango Orillac Building in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

A man walk pass a company list showing the Mossack Fonseca law firm at the Arango Orillac Building in Panama City May 9, 2016. The International Consortium of Investigative Journalists will release on May 9 a database with information on more than 200,000 offshore entities that are part of the Panama Papers investigation, according to local media. REUTERS/Carlos Jasso

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The sign of the Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

The Hollywood Presbyterian Medical Center is pictured in Los Angeles, California February 16, 2016. The FBI is investigating a cyber attack that has crippled the electronic database at Hollywood Presbyterian Medical Center for days, forcing doctors at the Los Angeles hospital to rely on telephones and fax machines to relay patient information. REUTERS/Mario Anzuoni

A Netatmo Welcome indoor security web camera is shown during the 2016 CES trade show in Las Vegas, Nevada January 8, 2016. The camera has face recognition and can ignore people that are already programmed into its database - only sending alerts when it senses an unfamiliar face. The camera retails for $199. REUTERS/Steve Marcus

An onboard display monitor of Mitsubishi Electric's self-driving concept car "EMIRAI3 xAUTO" shows a risk map of a right turn collision by analyzing both front camera images and the database of traffic accidents in the past during a media preview in Kamakura, south of Tokyo, Japan, October 14, 2015. REUTERS/Yuya Shino

A visitor takes a selfie with Baidu's robot Xiaodu at the 2015 Baidu World Conference in Beijing, China, September 8, 2015. Xiaodu, an artificial intelligent robot developed by Baidu, has access to the company's search engine database and can respond to voice commands, Baidu says.REUTERS/Kim Kyung-Hoon

A visitor speaks to Baidu's robot Xiaodu at the 2015 Baidu World Conference in Beijing, China, September 8, 2015. Xiaodu, an artificial intelligent robot developed by Baidu, has access to the company's search engine database and can respond to voice commands, Baidu says.REUTERS/Kim Kyung-Hoon

Baidu's robot Xiaodu (L) is seen on display at the 2015 Baidu World Conference in Beijing, China, September 8, 2015. Xiaodu, an artificial intelligent robot developed by Baidu, has access to the company's search engine database and can respond to voice commands, Baidu says.REUTERS/Kim Kyung-Hoon

A surfer carries his board as he walks along Sydney's Bondi Beach in Australia, August 18, 2015. A spate of shark attacks in Australia has left some of world's top surfing beaches deserted and many people having second thoughts about taking a swim as the summer approaches. There have been 11 shark attacks in the New South Wales state this year, compared with only three in both 2014 and 2013, according to the Australian Shark Attack database, and many folks will be staying out of the water. REUTERS/David Gray

Ana Rodas holds a picture of her son Juan Carlos Aceituno who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS/Jorge Cabrera

A member (L) of the Argentine Team of Forensic Anthropology (EAAF) takes a blood sample for DNA testing from a man with a missing relative, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 11, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 11, 2015. REUTERS/Jorge Cabrera

Ana Rodas is seen inside her home as she waits for news of her son Juan Carlos Aceituno, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS Jorge Cabrera

Benjamin Aceituno (L) and his wife Ana Rodas (R) wait for news of their son Juan Carlos Aceituno who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS/Jorge Cabrera

A member (R) of the Argentine Team of Forensic Anthropology (EAAF) takes a blood sample for DNA testing from a man with a missing relative, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 11, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 11, 2015. REUTERS/Jorge Cabrera

A member (L) of the Argentine Team of Forensic Anthropology (EAAF) takes a blood sample for DNA testing from a man with a missing relative, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 11, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 11, 2015. REUTERS/Jorge Cabrera

Benjamin Aceituno and his wife Ana Rodas pose with a picture of their son Juan Carlos Aceituno, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS/Jorge Cabrera

Benjamin Aceituno (2nd L) and his wife Ana Rodas (2nd R) pose with a picture of their son Juan Carlos Aceituno, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS/Jorge Cabrera

Benjamin Aceituno reaches for a photo frame of his son Juan Carlos Aceituno, who disappeared during his journey through Mexico to reach the U.S., at the town of the Ermita outside Tegucigalpa, Honduras August 12, 2015. A group of Argentine forensic scientists have gathered in the Honduran capital of Tegucigalpa, hoping to help provide answers on the fate of the missing by building a DNA database from family members of those who have gone missing on the trek north. Picture taken on August 12, 2015. REUTERS/Jorge Cabrera TPX IMAGES OF THE DAY

The Hudson County Correctional Center is pictured in Kearny, New Jersey May 28, 2015. A former senior Chinese official, who went into hiding after being sought by anti-corruption investigators in China, has been detained in the United States, the U.S. Immigration and Customs Enforcement said on Thursday. Yang Xiuzhu, a senior official who oversaw construction projects in the booming eastern province of Zhejiang, is in U.S. custody pending her removal to China, Luis Martinez, a spokesman for the U.S. immigration agency, said in a statement. According to the immigration agency's database, a Chinese national by the name of Yang Xiuzhu is being held at a detention facility in Hudson County, New Jersey. REUTERS/Eduardo Munoz