China has released genome sequencing data for the coronavirus responsible for a recent outbreak in Beijing, with officials saying on Friday it identified a European strain based on preliminary studies.
China, which had been under pressure to make the data public sooner rather than later as Covid-19 cases mount in the country's capital, said it had also submitted the data to the World Health Organisation.
The US administration has blamed the Chinese government for not handling the initial outbreak in central China properly and moving too slowly to contain the epidemic, leading to mounting cases and deaths in the United States.
China has rejected that accusation, saying it wasted no time in releasing information about the epidemic including the genome sequence of the initial coronavirus outbreak in Wuhan.
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Coronavirus around the world
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A fan uses her mobile phone during a screening for the movie "The Rental" at the Vineland Drive-In movie theater in City of Industry, California, USA. Reuters -
Prime Minister Justin Trudeau arrives to Parliament Hill amid the Covid19 pandemic in Ottawa, Canada. The Canadian Press via AP -
Guillerma Torres, wearing a face mask to curb the spread of the new coronavirus, carries a basket of fruit on her head to sell, on a street in Tegucigalpa, Honduras. AP Photo -
Health worker Ulises Cardenas Santana attempts to get a sample for Covid19 testing, from a man at the Central de Abasto market in Mexico City. AP Photo -
A health worker wears a protective suit and a face shield as he collects nasopharyngeal swab samples from residents for coronavirus testing at a community health center in Banda Aceh, Indonesia. EPA -
Children ride their bicycles, as the first phase to ease the quarantine imposed to prevent the spread of the new coronavirus starts, in San Jose de las Lajas, Mayabeque province, Cuba. AFP -
Doctors of the Brazilian Armed Forces check an indigenous child of the Mayoruna ethnic group, in the Cruzeirinho village, near Palmeiras do Javari, Amazonas state, northern Brazil. AFP -
An 11-year-old Covid19 patient arrives on a boat from a nearby community at a port in the Amazon River, in Iquitos, Loreto region, Peru, to be transferred to the regional hospital of the city. AFP -
A Chinese woman has her temperature checked by thermal imaging at the entrance to a local market in Beijing, China. Getty Images -
Customers purchase face masks made by Japan's Fast Retailing Co. at a Uniqlo store in Tokyo's Ginza shopping district in Japan. AFP -
A baker handles some bread at Tresoldi Bakery in Bergamo, Italy, as the city is slowly returning to normality after the lockdown. Getty Images -
People eat at a busy steamboat restaurant in Singapore as the city state reopens the economy amid the coronavirus disease outbreak. Reuters -
Members of the faculty of Mount San Antonio College present diplomas to graduating students at the school's first drive-thru commencement ceremony, in Walnut, California, USA. AFP -
Tongs are used to give surgical masks to guests entering the Westgate Las Vegas Resort & Casino after the property opened for the first time since being closed in mid-March because of the coronavirus pandemic on June 18, 2020 in Las Vegas, Nevada, USA. AFP -
A coffin maker works in a production line of coffins at the Bergut Funeral Services in Santiago, Chile. The coffin production has had to increase up to 120%, according to Nicolas Bergerie, owner of the factory. AP Photo -
Commuters wait as police personnel check for valid travel credentials after a lockdown was reimposed as a preventive measure against the spread of the Covid19 coronavirus, in Chennai, India. AFP -
A tourist walks on Alcudia beach in Alcudia, Mallorca, Spain. Getty Images -
Tea lights are seen after nursing home workers and advocates lit over 3,400 of them on the steps of the state Capitol in Harrisburg, Pennsylvania to represent the women and men who have died of Covid19 in Pennsylvania nursing homes. The Patriot-News via AP
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In the latest Beijing outbreak, the WHO said on Sunday it had been informed by the Chinese of ongoing investigations into the source of the cluster and the extent of the infections. It requested for the genetic sequences to be released as soon as possible.
The genome sequencing was published late on Thursday, and had also been shared with the WHO and the Global Influenza Data Initiative (GISAID), said the Chinese Centre for Disease Control and Prevention (CDC).
Virus genome sequencing is a vital and rapidly developing tool in the diagnosis of the disease Covid-19 and in understanding the spread and control of the new coronavirus.
Details published on China's National Microbiology Data Centre website revealed the Beijing genome data was based on three samples – two human and one environmental – collected on June 11.
That was the same day the Chinese capital reported its first new local Covid-19 infection in months. In the eight days since, Beijing has reported a total of 183 cases, linked to the sprawling wholesale food centre of Xinfadi in the city's south-west.
"According to preliminary genomic and epidemiological study results, the virus is from Europe, but it is different from the virus currently spreading in Europe," CDC official Zhang Yong said in an article published on Friday.
"It's older than the virus currently spreading in Europe."
Mr Zhang said there were several possibilities as to how the virus arrived in China.
"It could have been hidden in imported frozen food products, or it was lurking in some dark and humid environment such as Xinfadi, with the environment not having been disinfected or sterilised," Mr Zhang wrote in the article posted on the Central Commission for Discipline Inspection's website.
Wu Zunyou, the CDC's chief epidemiology expert, had told state media earlier this week the Beijing strain was similar to Europe's, although not necessarily directly transmitted from European countries.
The coronavirus strains found in the United States and Russia were mostly from Europe, he added.
The first major cluster of new coronavirus infections was traced to the Huanan seafood market in Wuhan in December. It has since spread globally, infecting almost 8.5 million people and killing about 450,000.
On tracing the origins of the strain that hit Beijing, Mr Wu said the virus did not originate from the Chinese capital.
"It must be some people or goods outside of the city that carried it into the [Xinfadi] market," Mr Wu said in an interview with state television aired on Friday.
"It's unclear who, or what kind of goods, had brought the virus into Beijing."
