Coronavirus
Now playing
02:29
NYC mayor rejects mask mandate amid high Covid-19 alert
TOPSHOT - Employees spray disinfectant and wipe surfaces as part of preventative measures against the Covid-19 coronavirus at the Pyongyang Children's Department Store in Pyongyang on March 18, 2022. (Photo by KIM Won Jin / AFP) (Photo by KIM WON JIN/AFP via Getty Images)
Now playing
02:12
North Korea declares national emergency over reported Covid-19 cases
Now playing
04:35
Parents, children, superstars, and politicians killed by Covid-19
Johnson & Johnson's Janssen Covid-19 vaccine awaits administration at a vaccination clinic in Los Angeles, California on December 15, 2021. (Photo by Frederic J. BROWN / AFP) (Photo by FREDERIC J. BROWN/AFP via Getty Images)
Now playing
01:08
This is why you should still have confidence in the FDA for vaccines
Now playing
01:53
What we can learn from the WHO Covid mortality numbers
Now playing
01:18
Shanghai police barge down door in resident's apartment
Now playing
00:56
Dr. Ashish Jha predicts what's next with Covid-19
Now playing
03:36
See Dr. Gupta's reaction to judge ending mask mandate
Now playing
03:55
Dr. Sanjay Gupta reacts to 'abrupt' end of mask mandate for travelers
DULLES, VIRGINIA - MARCH 13: Passengers wearing masks arrive at Dulles International Airport March 13, 2020 in Dulles, Virginia. U.S. President Donald Trump announced restrictions on travel from Europe two days ago due to an outbreak of coronavirus (COVID-19). Today is the last day of unrestricted travel from Europe into the United States.  (Photo by Win McNamee/Getty Images)
Now playing
02:13
'Huge shift in travel policy': Travel mask mandate no longer in effect
WASHINGTON, DC - DECEMBER 21:  People pass a sign that reads "Face Mask Required" in a mall as COVID-19 cases surge in the city on December 21, 2021 in Washington, DC. District of Columbia Mayor Muriel Bowser reinstated the city's indoor mask mandate at 6am on Tuesday and announced a vaccination mandate for government employees after COVID-19 case numbers have surged to a new high.  (Photo by Alex Wong/Getty Images)
Now playing
03:43
This is how fraudsters peddled counterfeit Covid tests and masks
FILE - Customers wear face masks to protect against the spread of the coronavirus as they shop at the Reading Terminal Market in Philadelphia, Feb. 16, 2022.  COVID cases are starting to rise again in the United States, with numbers up in most states and up steeply in several. One expert says he expects more of a "bump" than the monstrous surge of the first omicron wave, but another says it's unclear how high the curve will rise and it may be more like a hill. (AP Photo/Matt Rourke, File)
Now playing
02:01
Business owners and residents sue Philly for reinstating mask mandate
Now playing
02:19
'Our priorities are skewed here': Doctor weighs in on Covid laxity
Now playing
03:41
China battles biggest surge in Covid cases since original Wuhan outbreak
china zero covid beijing winter olympics marketplace asia hnk _00012317.png
Now playing
04:08
How much longer can China's economy handle 'zero-Covid'?
CNN  — 

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said on Wednesday that he thinks there will be an uptick in cases of Covid-19 over the next few weeks and that it is likely that there could be a surge in the fall.

“I think we should expect, David, that over the next couple of weeks, we are going to see an uptick in cases – and hopefully there is enough background immunity so that we don’t wind up with a lot of hospitalizations,” Fauci said when asked by Bloomberg TV’s David Westin about the prospect of another wave of Covid-19 from BA.2 or another variant, given the level of immunity believed to exist in the US today.

Fauci reiterated that the US often follows other countries, offering the UK, which also has the BA.2 variant, as an example. He said that as well as a pullback on many mask mandates and restrictions for indoor settings, there has been a waning of immunity.

“Those conditions are also present in the United States,” he said. “So, I would not be surprised if we see an uptick in cases. Whether that uptick becomes a surge where there are a lot more cases is difficult to predict.”

Asked later whether it should be expected that this fall will look like the past two – and if people should be bracing for something around October – Fauci said that he thinks “it is likely that we will see a surge in the fall.”

Get CNN Health's weekly newsletter

Sign up here to get The Results Are In with Dr. Sanjay Gupta every Tuesday from the CNN Health team.

He noted that “these are uncharted waters for us with this virus” and that with other viruses, such as flu – which people have decades of experience with – predictions about what might happen can be made with some degree of accuracy.

“I would think that we should expect that we are going to see some increase in cases as you get to the colder weather in the fall,” he said. “That’s the reason why the [Food and Drug Administration] and their advisory committee are meeting right now to plan a strategy, and we at the [National Institutes of Health] are doing studies now to determine what the best boost would be.”

CNN’s Virginia Langmaid contributed to this report.