Video report by ITV News Washington Correspondent Robert Moore
The nation’s leading infectious disease expert made the remark at a Senate hearing on reopening schools and workplaces.
Asked to forecast the outcome of recent surges in some states, Dr Fauci said he cannot make an accurate prediction, but believes it will be “very disturbing”.
“We are now having forty-plus-thousand new cases a day. I would not be surprised if we go up to to 100,000 a day if this does not turn around, and so I am very concerned,” said Dr Fauci, infectious disease chief at the National Institutes of Health.
Dr Fauci said areas seeing recent outbreaks are putting the entire nation at risk, including areas that have made progress in reducing Covid-19 cases.
He cited recent video footage of people socialising in crowds, often without masks, and otherwise ignoring safety guidelines.
Infections are rising rapidly mostly in parts of the West and South, and Fauci and other public health experts said Americans everywhere will have to start following key recommendations if they want to get back to more normal activities like going to school.
“We’ve got to get the message out that we are all in this together,” by wearing masks in public and keeping out of crowds, said Fauci.