Director of the US Centers for Disease Control and Prevention (CDC) has warned that the US is at risk of losing its recent vaccine progress in the battle against the Covid-19 pandemic with the new variants posing a 'real threat'.
The spread of highly contagious coronavirus variants is threatening to fuel a "potential fourth surge of cases" in the US, CDC director Rochelle Walensky said. She said she was concerned by recent Covid-19 data.
Health experts are particularly concerned about a few which appear to be more contagious, including those first detected in the UK, South Africa and Brazil. Walenksy emphasised that these variants are a threat to the people and the progress against the virus. Additionally, the CDC predicted that the highly contagious B.1.1.7 variant first found in the UK will become the dominant strain in the US this month.