This it thanks the US’ immunisation scheme ramping up its vaccination speed with three million people receiving shots each day.
However, the country’s public health officials said the encouraging news did not mean the fight against the virus was over.
On Monday, Andy Slavitt, the White House senior pandemic advisor, warned against seeing the advance as a victory at a White House press briefing.
He said: “But as you heard the president say: We’re not there yet.
“The war against Covid-19 is far from over, far from won.
“The worst thing we could do right now would be to mistake progress for victory.
“If we let our guard down now, we will see more of our fellow Americans get sick and die unnecessarily.”
Last week, CDC Director Dr Rochelle Walensky admitted during a press briefing that she had a feeling “of impending doom”.
She said: “When I first started at CDC about two months ago I made a promise to you: I would tell you the truth even if it was not the news we wanted to hear.
“Now is one of those times when I have to share the truth, and I have to hope and trust you will listen.”
She added: “I’m going to pause here, I’m going to lose the script, and I’m going to reflect on the recurring feeling I have of impending doom.