Those who are vaccinated, get tested before traveling, or gather in well-ventilated spaces and use masks carry a low risk of spreading the virus, Murthy said.
"We have about 90 to 100,000 cases a day right now in the United States, and 99.9 percent of them are the Delta variant," Walensky said.
Omicron has now been detected in at least five states: California, Colorado, Hawaii, Minnesota and New York.
Californian couple Tyler Redondo and Angelina Redondo, the parents of three-month-old Tyler, want to use their experience to warn other parents about COVID.
A top health official in Wisconsin said 97 percent of intensive care beds and 98 percent of intermediate care beds are filled as COVID cases rise in the state.
U.S. medical professionals worry about how they will tackle the Omicron variant with so many swamped in the ongoing battle against Delta.
In South Korea, there are 733 patients who are deemed to be in serious or critical condition and the COVID-19 ICU's are at 90 percent capacity.
Scientists and health officials fear Omicron may be more transmissible than other COVID-19 variants, but much is still unknown about the strain.
The Omicron variant has been designated a variant of concern, two years since the pandemic started, prompting questions about what the future holds.
The Omicron COVID variant has been identified as a variant of concern, joining Delta—the variant currently responsible for more new infections than any other form of the virus.
The South African doctor who first reported the Omicron variant says she noticed two common symptoms were missing from patients with this form of coronavirus.
The report looks at 1.2 million deliveries in 736 hospitals from March 2020 to September 2021 in which 21,653 of the women had COVID-19.
The variant may spread faster than the original form of Delta, which is now the most dominant strain in the world.
Nationwide hospitalizations have stabilized, but certain pockets of the country are still dealing with a burst of new cases.
The variant appears to have a small growth advantage over Delta but does not resist vaccines more easily, according to recent findings.
One doctor said people spending more time indoors is "always going to be associated with a greater risk of transmission of any virus."
The Delta sub-type is thought to be better at spreading than other forms of Delta, but does not appear to have an advantage when it comes to vaccines.
"Right now, our problem is the Delta variant, without a doubt," the nation's top infectious diseases expert said.
Scientists are investigating the off-shoot of Delta, which has been detected in 11 U.S. states, to see what advantages it may have over past forms of COVID.
The Delta sub-variant of coronavirus continues to spread, but U.S. totals have varied widely in recent days, data shows.
The decline can largely be attributed to the increased rate of vaccination in the U.S. as a result of the growing number of vaccine mandates.
On Monday, Utah's Hogle Zoo issued a press release on Facebook after discovering that the four lions contracted COVID-19.
The variant is increasingly spreading around the U.K. and U.S., but little is known about what exact biological advantages it might have.
The Delta variant offshoot, found in dozens of countries, could be more transmissible than other Delta mutants.
AY.4.2 is an evolution of the original Delta variant, which was first identified in the U.K. and has since become the dominant form of SARS-CoV-2 globally.
The WHO is tracking at least 14 COVID-19 variants that emerged after the highly contagious Delta was discovered.
An expert told Newsweek it seems increasingly likely that the offshoot is more transmissible than other Delta variants.
Scientists are paying close attention to AY.4.2, an offshoot that could possibly be more contagious than the original form of Delta.
The variant, called AY.4.2, is being monitored by U.K. authorities after COVID cases caused by it rose sharply in recent months.
Scientists are keeping a close eye on the Delta offshoot, known as AY.4.2, which has been spreading in the U.K. since July.