US expects 100 million people vaccinated by February

The US hopes to have immunized 100 million people against Covid-19 by the end of February, a top official said Wednesday, which is approximately 40 percent of the country's adult population. The push should start within weeks, when vaccines developed by Pfizer-BioNTech and Moderna-NIH are expected to be approved. Each of these require two doses, the second after three weeks