Updated 12:03 a.m. ET, February 13, 2021 What you need to know The UK coronavirus variant could "impact the epidemic curve" and lead to more restrictions in Europe if it becomes the dominant strain, a World Health Organization official warned. The top US infectious diseases expert says the country may be able to vaccinate the majority of Americans by the middle or end of summer. More US states are loosening Covid-19 restrictions, even as experts warn the country is still not in the clear — especially as variants spread. Double masking can significantly improve protection against the virus, new CDC data shows. share with Facebook