The Biden administration is set to announce on Thursday that it is deploying response teams across the US to areas with a high spread of the highly contagious Delta variant of Covid-19 as concerns grow around the nation, a White House official told CNN.The Biden administration is set to announce on Thursday that it is deploying response teams across the US to areas with a high spread of the highly contagious Delta variant of Covid-19 as concerns grow around the nation, a White House official told CNN.