WHO: Infectivity of mutated COVID-19 increased by 40%-70%
WHO: Infectivity of mutated COVID-19 increased by 40%-70%. WHO releases information on mutated new coronavirus in the UK: Infectivity increased by 40%-70%.
On the 22nd local time, the WHO released relevant information about the mutant new coronavirus reported in the UK. On December 14, the United Kingdom reported to the WHO that a new variant of the new coronavirus was discovered through viral gene sequencing. Preliminary analysis shows that this variant is more likely to spread from person to person, with an estimated increase in infectivity of 40%-70%, and a transmission index increase of 0.4 between 1.5-1.7. As of December 13, a total of 1,108 cases of the mutant virus have been detected in the UK.
Previously, there had been an unexpected increase in the number of new coronavirus pneumonia cases in southeast England. Epidemiological studies and virological investigations were carried out in early December, and the variant was discovered. From October 5th to December 13th, the notification rate of new cases in 14 days increased by more than three times.
Since the outbreak, the UK has carried out routine sequencing of 5% to 10% of the new coronavirus, and southeast England has carried out routine sequencing of 4% of the new coronavirus. From October 5th to December 13th, more than 50% of the strains in southeast England were of this variant. A retrospective study found that the variant first appeared in Kent in southeastern England on September 20, and most of the cases infected with the variant were under 60 years of age.
WHO recommends further epidemiological and virological research to understand the changes in infectivity and pathogenicity of mutant viruses. The WHO recommends that all countries increase routine sequencing of the new coronavirus when possible, and share viral genetic sequence data, especially to report whether the same mutant virus has been found. All countries must assess the level of local virus transmission and take appropriate preventive and control measures.