Dr. Anthony Fauci, the top U.S. infectious disease expert, said he has had no contact with President-elect Joe Biden’s coronavirus transition team and sees no reason to quit to join that effort when there is so much to do now to fight the surging pandemic.

The number of coronavirus patients in U.S. hospitals breached 50,000, the highest level in nearly three months, as a surge in infections threatens to push the nation’s health care system to the edge of capacity.

The White House coronavirus task force warned that much of the country is in the grips of an “unrelenting” surge in Covid-19 cases and urged tough countermeasures, as the reported number of U.S. infections hit a new daily record of more than 91,000.