The virus that causes Covid-19 has not mutated into different types, according to new analysis.
Recent research had suggested more than one type of SARS-CoV-2, the virus that causes Covid-19, is now circulating, with one strain being more aggressive and causing more serious illness than the other.
However using analysis of SARS-CoV-2 virus samples, scientists from the Medical Research Council-University of Glasgow Centre for Virus Research (CVR) have found only one type of the virus.
Viruses, including the one causing Covid-19, naturally accumulate mutations – or changes – in their genetic sequence as they spread through populations.
Scientists said most of these changes will have no effect on the biology of the virus or the aggressiveness of the disease they cause.
Dr Oscar MacLean, from the CVR, said: “By analysing the extensive genetic sequence variation present in the genomes of the SARS-CoV-2 virus, the evolutionary analysis shows why these claims that multiple types of the virus are currently circulating are unfounded.
“It is important people are not concerned about virus mutations – these are normal and expected as a virus passes through a population.
“However, these mutations can be useful as they allow us to track transmission history and understand the historic pattern of global spread.”
It was reported earlier this year that scientists had found two or three strains of SARS-CoV-2 circulating in the population, evidenced by certain mutations that had been detected.
However extensive analysis by the team found these detected mutations are unlikely to have any functional significance, and, importantly, do not represent different virus types.
The centre’s CoV-GLUE resource tracks SARS-CoV-2’s amino acid replacements, insertions and deletions, which have been observed in samples from the pandemic.
To date the database has catalogued 7,237 mutations in the pandemic.
Scientists said that while this may sound like a lot of change, it is a relatively low rate of evolution for a virus that has ribonucleic acid (RNA) as its genetic material.
They expect more mutations will continue to accumulate as the pandemic continues.
Most observed mutations would be expected to have no, or minimal, consequence to the virus’s biology, however tracking these changes can help scientists better understand the pandemic and how Covid-19 is spreading in the community.
The study is published in Virus Evolution and the work was funded by the Medical Research Council.
Featured image via Twitter – University of Glasgow
We need your help ...
The coronavirus pandemic is changing our world, fast. And we will do all we can to keep bringing you news and analysis throughout. But we are worried about maintaining enough income to pay our staff and minimal overheads.
Now, more than ever, we need a vibrant, independent media that holds the government to account and calls it out when it puts vested economic interests above human lives. We need a media that shows solidarity with the people most affected by the crisis – and one that can help to build a world based on collaboration and compassion.
We have been fighting against an establishment that is trying to shut us down. And like most independent media, we don’t have the deep pockets of investors to call on to bail us out.
Can you help by chipping in a few pounds each month?