The US has 'screaming level' of Covid-19 transmission, expert says, as country adds nearly 4 million cases this month CNNNew COVID-19 strains shows possible 'resistance' to antibody, but not vaccines Fox NewsCDC: More contagious COVID-19 strain could lead to spike in U.S. cases by March WGN TV ChicagoHighly transmissible COVID-19 variant first found in U.K.