A dangerous Covid-19 variant has spread to all 50 US states. Experts worry it could send cases surging

The highly contagious Covid-19 variant first identified in the UK has now been reported in every state in the US, and experts are concerned spreading variants could send cases surging.The highly contagious Covid-19 variant first identified in the UK has now been reported in every state in the US, and experts are concerned spreading variants could send cases surging.