New COVID-19 cases could hit 100k per day -Fauci

Fauci warned that the daily increase of new cases in the United States, currently around 40,000, could reach 100,000 if people do not adhere to social distancing guidelines and wear masks.

"I am very concerned because it could get very bad," he said on Tuesday (June 30).

His remarks dovetailed with warnings by health officials that some Americans, particularly younger adults, have let down their guard since the end of mandatory lockdowns put in place in March and April to stop the pandemic.

Many states where the virus is now surging began reopening businesses without having met government health benchmarks for doing so safely.