And a medical education association is warning that the US must control the pandemic now, or risk seeing deaths skyrocket "well into the multiple hundreds of thousands."

"Decisive, coordinated action is urgently needed to save lives, end the pandemic, restore America's economy, and return our lives to normalcy," Dr. David Skorton, AAMC president and CEO, said Wednesday.

Disease trends are mixed: Deaths are increasing and hospitalizations are at or near peak levels, though new, daily reported infections are declining slightly.

But health experts have warned the death rate likely would rise as it is now, as a lagging consequence of a large spike in cases weeks earlier especially in the South and West.

Infectious disease experts say the country is now at a critical juncture, as the debate about how and whether to reopen schools for in-person learning rumbles on.

Case rates rose as businesses reopened and distancing rules relaxed in late spring, and those wanting more normalcy soon should get more disciplined now by wearing masks, limiting outdoor dining and social gatherings, and closing bars, Dr. Anthony Fauci said.

"It's not going to spontaneously come down," Fauci, director of the National Institute of Allergy and Infectious Diseases, said Tuesday in a call with several governors about the pandemic.

Some key figures about the pandemic in the US:

More than 1,240 deaths were reported Tuesday -- the most in a day since May 27, according to Johns Hopkins figures.

The seven-day average of daily deaths rose above 1,000 Tuesday -- the first first time since June 2.

In 29 states, average daily deaths were at least 10% higher over the previous week, according to Johns Hopkins data.

Rates of new infections are falling. The seven-day average for new daily cases was 64,684 Tuesday -- about 3% lower than a week ago.

Group: Take these steps, or see deaths skyrocket

It did not say when this tally might be reached, or forecast the number more precisely.

It urges the Trump administration to invoke the Defense Production Act, or determine other means, to solve critical shortages in Covid-19 testing supplies and personal protective equipment; and to set targets for stockpiling supplies.

It also suggests ramping up Covid-19 testing capacity to more than 2 million a day and reducing the turnaround time for test results.

And it calls for "national standards on face coverings to stop the spread, especially by asymptomatic individuals, and make them mandatory in areas of growing community spread."

The document also advocates "establishing and enforcing national criteria for local stay-at-home orders and reopening protocols."

The AAMC says it represents all accredited medical schools in the United States and 17 in Canada, as well as 400 teaching hospitals.

Reopening schools will provide insight into virus

With schools closed since March and April, a knowledge gap has persisted around how young children experience and spread the virus, Fauci, the United States' top infectious disease doctor, said.

"Though this may sound a little scary and harsh -- I don't mean it to be that way -- is that you're going to be actually part of the experiment of the learning curve of what we need to know," Fauci said during a discussion with Randi Weingarten, president of the American Federation of Teachers.

"We don't know the full impact," he said. "We don't have the total database of knowing what there is to expect."

Some states have begun to put plans in place to make in-person learning safer and online learning more effective. Tennessee announced testing and contact-tracing measures within schools, Oregon set restrictions for schools that can allow students back and Connecticut is investing $43.5 million in providing digital devices to help students learn remotely.

Although Fauci said that there is no "uni-dimensional answer" to how schools should reopen he reiterated that the "default position should be that we should try to the best of our ability to get the children back to school."

"I feel with some cautious optimism that it is a reasonable statement to make that by December we're going to have a safe and effective vaccine."

Drug rumors distracting from 'most powerful weapon'

But the drug has not been shown to be effective against coronavirus, and can even produce harmful side effects, former US Surgeon General Dr. Vivek Murthy told CNN's Wolf Blitzer Tuesday.

"All the time that we often end up spending dispelling these myths around hydroxychloroquine is time that we are not spending working on solving the actual problem in front of us," Murthy said.

And measures already in place to combat the virus' spread could be the key to solving the problem, the US Centers of Disease Control and Prevention's Director Dr. Robert Redfield said Tuesday in an interview with ABC news.

"We have the most powerful weapon in our hands right now, I mean it's an enormously powerful weapon. It's just a simple, flimsy mask," Redfield said. "This virus can be defeated if people just wear a mask."

Numbers on the decline after face mask requirements

Although some states continue to see surges and set records in the numbers of coronavirus cases and hospitalizations, Tuesday's total of new cases across the nation stood at 61,660, slightly lower than at this point last week.

Kentucky, a state that is among the at least 41 to require masks, reported 532 new cases Tuesday and a 5.08% positivity rate, which has gone down for the first time in four days, Gov. Andy Beshear said.

"Again, too early to draw conclusions, but I hope I've said, I hope that this is us starting to see, because the time period is right, where the facial covering requirement is starting to kick in and help," Beshear added.

Fauci reiterated advice to states still seeing surges Tuesday: wear masks, social distance, close bars where spread is high, wash hands and reopen economies in phases.

CNN's Brandon Miller, Andrea Kane, Annie Grayer, Maggie Fox, Rebekah Riess and Steve Almasy contributed to this report.

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As US nears 150,000 coronavirus deaths, group warns of hundreds of thousands more without action - CNN