President-elect Joe Biden formally introduced the public health team that will support him in navigating the coronavirus pandemic and revealed goals to sustain the virus during his first 100 days, as lawmakers raised questions over some of his intended nominees.Mr. Biden stated during televised remarks on Tuesday that he will nominate California Attorney general Xavier Becerra to serve as secretary of Health and Human Services, highlighting his defense of the Affordable care Act. Mr. Biden also rolled out a coronavirus task force led by transition co-chairman Jeffrey Zients, a veteran of the Obama administration, and said Dr. Vivek Murthy will reprise his Obama-era role as US surgeon general and become the public face of the virus response.Mr.Biden outlined a three-step plan for the initial 100 days of his administration: urging everyone to wear masks in public and requiring them on Federal property and interstate transportation; delivering 100 million vaccine shots; and getting children back to school.