The dominant Omicron Covid-19 variant is 'most likely' to have come from mice, according to new research in the field..
Scientists undergoing studies now think that the strain developed in rodents, mice, mid-2020 before reinfecting humans - Wales Online reports.
Back in November 2021, the World Health Organisation (WHO) named the latest SARS-CoV-2 variant B.11.529, Omicron, as the fifth wave of concern since the beginning of the global pandemic in 2020.
