America's daily Covid-19 cases and deaths are now about one-fifth of what they were during their winter peaks -- and one expert says the country's improved numbers have a lot to do with the climbing vaccinations.
The weekly average of daily Covid-19 deaths is more than 660, according to Johns Hopkins University data. In mid-January, that seven-day average was roughly 3,400 deaths daily.
And the country has averaged more than 49,400 new Covid-19 cases daily in the past week, according to Johns Hopkins. On January 8, the country averaged more than 251,000 cases every day -- the highest seven-day average of the pandemic.
"We are starting to see the effects of all these vaccinations," Dr. Ashish Jha, dean of the Brown University School of Public Health told CNN on Monday.
Especially, he added, among the country's older population, which was prioritized early on for the shots.
Nearly 83% of Americans 65 and older have received at least one Covid-19 vaccine dose and nearly 70% are fully vaccinated, according to data from the Centers for Disease Control and Prevention.
And now health and state leaders are focusing on younger Americans, who polls show are least likely to say they want a shot.
"This pandemic now is really among young people and it is a very dangerous time to be unvaccinated in the country because it is spreading pretty efficiently among young people and unvaccinated people," Jha said.
CDC Director Dr. Rochelle Walensky warned last month the country was seeing an increase in cases and hospitalizations, predominantly among younger unvaccinated adults. And in Michigan, which battled a violent spring surge, hospitals saw more younger Covid-19 patients than ever before.
So it's critical that younger Americans get a shot as well, experts say, for both their own protection and to help the country reach widespread protection.
Governor: Young Oregonians hospitalized with 'severe' Covid-19
To help bring up vaccination numbers and suppress the spread of coronavirus, governors are now appealing to younger residents.
In Oregon, Gov. Kate Brown recently tightened some restrictions amid a surge in new cases and hospitalizations.
"Younger, unvaccinated Oregonians are now showing up in our hospitals with severe cases of COVID-19," Brown said in a statement. "We need Oregonians to step up and take on the personal responsibility to get vaccinated."
West Virginia Gov. Jim Justice said last week the state is offering a $100 savings bond to residents 16 to 35 who choose to get vaccinated.
On Monday, he added officials are now also focusing on "new communication strategies to be able to really target our younger people through social media and streaming services."
"If we have to go door-to-door, we'll go door-to-door," Justice said in a statement. "We know these vaccines are incredibly safe and we know what can happen for those who are exposed and what is happening all across this land."
US could be dealing with this for 'a long time'
The US vaccination rate has slowed, and experts say the country is now at the hard part of its inoculation efforts: reaching Americans who aren't as eager to get a shot or still have challenges with access.
More than 44% of the total US population has gotten at least one vaccine dose and nearly 32% is fully vaccinated, CDC data shows.
Among US adults, more than 56% have gotten at least one shot, the data shows, and more than 40.5% are fully vaccinated.
Once the US is able to vaccinate more than 70% of its adults, we may finally be able to see a semblance of normalcy, Jha said on Monday.
"Case numbers will plummet. We may not be at herd immunity, we'll see little outbreaks here and there but life will begin to really get back to normal," he said.
But what if we don't get there?
"That's a problem," Jha said. "We're going to be stuck with dealing with this for a long time."
"If we just don't vaccinate, then obviously one of the things we've known is we get big outbreaks, you can get more variants," he said. "It's going to be hard to do those large gatherings, indoor concerts, outdoor baseball games, this stuff will get much, much harder if we do not make more progress on vaccinations," he added.
What could likely happen, one expert said, is communities that have a lower vaccination coverage will continue to see high transmission of the virus, while in other parts of the country with more vaccinations, case rates will be much lower.
"In this country, there's a real divide around vaccination," former acting CDC director Dr. Richard Besser told CNN. "People tend to live among people with similar beliefs."
An important authorization could come next week
The one puzzle piece experts say is missing is getting children inoculated.
But there's good news on that front.
A federal government official told CNN the Food and Drug Administration is poised to authorize Pfizer/BioNTech's Covid-19 vaccine in children and teens 12 to 15 years old by early next week.
Pfizer has applied for emergency use authorization. The FDA, which is currently reviewing data submitted by Pfizer, will have to amend the emergency use authorization for the vaccine, but the process should be straightforward, the official said.
A group of advisers to the CDC will schedule a meeting for after any FDA decision to extend the EUA to new age groups and will advise the CDC on whether to recommend the use of the vaccine in 12 to 15 year-olds.
Walensky will then have to decide whether the agency will recommend the vaccine's use in the new age group.
"That will immediately add millions of more people eligible for vaccination. I bet a lot of those kids will get vaccinated," Jha told CNN. "That will make a big difference as well in terms of building up population immunity."
Pfizer and Moderna are both testing their vaccines in children as young as 6 months old and expect to ask the FDA for EUAs covering infants and children later this year.
CNN's Deidre McPhillips and Maggie Fox contributed to this report.