Trump appeared to sharpen his tone on Friday, when he declared a national emergency, though he suddenly claimed that widespread testing was \"unnecessary.\"

\"We don't want everybody taking this test,\" Trump said. \"It's totally unnecessary. And this will pass.\"

On Monday, however, the World Health Organization delivered a simple message to all countries.

\"Test every suspected COVID-19 case,\" W.H.O. Director-General Dr. Tedros Adhanom Ghebreyesus said. \"If they test positive, isolate them and find out who they have been in close contact with up to two days before they developed symptoms and test those people too.\"

WHO director-general says the organization is shipping personal protective equipment and COVID-19 tests globally, but urges countries to \"take a comprehensive approach.\"

\"Not testing alone. Not contact tracing alone. Not quarantine alone... do it all.\" https://t.co/w2OcPMGHVY pic.twitter.com/iOIiGbshF2

— ABC News Politics (@ABCPolitics) March 13, 2020

Adm. Brett Giroir, the Department of Health and Human Services' assistant secretary of health, reported nearly 60,000 tests had been conducted in the United States as of Tuesday.

In South Korea, meanwhile, which had its first reported case on Jan. 20 -- the same day as the U.S. -- has since demonstrated the capacity to conduct at least 10,000 tests per day.

\"PHOTO:
Patrick Semansky/AP
PHOTO: Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, testifies before a House Oversight Committee hearing on preparedness for and response to the coronavirus outbreak on Capitol Hill, March 11, 2020.
>

Experts: Even with limited testing, case numbers are growing

Trump has repeatedly claimed that the virus is being contained, even predicting that it will disappear one day \"like a miracle.\"

Last month, as the number of Americans infected with the virus grew to 60, Trump told the public that the number of coronavirus cases in the country was dwindling near zero.

\"We're going very substantially down, not up. Going very substantially down. Schools should be preparing. Get ready just in case. The words are 'Just in case.' We don't think we'll be there. We don't think we'll be anywhere close.\" Trump said during a news conference on Feb. 26. \"When you have 15 people and the 15 within a couple days is going to be down to close to zero, that's a pretty good job we've done.\"

In the three weeks since, the virus has infected at least 10,000 people across all 50 U.S. states, Washington, D.C., and Puerto Rico.

Fauci again delivered a more sobering assessment when he testified before the Congress last week: \"Bottom line, it's going to get worse.\"

According to Tom Bossert, a former homeland security adviser to President Trump who is now an ABC News contributor, \"success will look like we overreacted.\"

\"For public officials in a crisis, you tell people everything you know and everything you do not know. Acknowledge uncertainty. Don't over-promise or over-reassure,\" Bossert said. \"Admit when you could have done better, and most importantly for leaders, explain to people what the future will hold.\"

\"PHOTO:
Hyosub Shin/AP, Marietta Daily, Gwinnett Daily Post, WXIA-TV, WGCL-TV
PHOTO: President Donald Trump holds a photograph of coronavirus as Dr. Steve Monroe,right, with CDC speaks to members of the press at the headquarters of the Centers for Disease Control and Prevention in Atlanta on March 6, 2020.
>

Experts: Coronavirus is likely more lethal than the the flu

Trump has made several comparisons to the flu since the coronavirus arrived in the United States.

On March 3, World Health Organization Director Dr. Ghebreyesus made an alarming announcement.

\"Globally, about 3.4 percent of reported COVID-19 cases have died,” he said. “By comparison, seasonal flu generally kills far fewer than one percent of those infected.\"

But in a phone call with Sean Hannity on March 4, Trump said he had a \"hunch\" that the World Health Organization’s estimated 3.4 percent death rate for those infected with coronavirus was a \"false number.\"

On March 9, the president tweeted: \"So last year 37,000 Americans died from the common Flu. It averages between 27,000 and 70,000 per year. Nothing is shut down, life & the economy go on... Think about that!\"

So last year 37,000 Americans died from the common Flu. It averages between 27,000 and 70,000 per year. Nothing is shut down, life & the economy go on. At this moment there are 546 confirmed cases of CoronaVirus, with 22 deaths. Think about that!

— Donald J. Trump (@realDonaldTrump) March 9, 2020

While death rates for diseases can vary over time and are different for each country, Dr. Fauci also told Congress that coronavirus is likely \"ten times more lethal than the seasonal flu,\" which averages a 0.1 percent fatality rate.

COVID-19, meanwhile, has already infected at least 214,890 people globally and killed at least 8,730, according to data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.

\"The mixed messaging can actually lead to a more dangerous situation,\" Cohen said, \"because if people aren't doing their part to control the spread of this virus, those who are most vulnerable to becoming extraordinarily ill may get exposed.\"

\"PHOTO:
Xinhua/Chen Junxia via Getty Images
PHOTO: World Health Organization Director-General Tedros Adhanom Ghebreyesus speaks at a press conference in Geneva, Switzerland, on March 11, 2020.
>

Experts: A vaccine is at least a year away

At a White House roundtable in the first week of March, Trump predicted the speedy arrival of a coronavirus vaccine.

\"I've heard very quick numbers,\" Trump said. \"That of months.\"

He doubled down on the claim last week, saying the vaccine is coming \"relatively soon.\"

But according to public health experts, a coronavirus vaccine will likely take around 18 months to develop, produce and distribute.

On Monday, Fauci announced that clinical trials for the vaccine had started in \"record time,\" but he cautioned they still have to monitor those participants for a year to ensure it's safe.

\"The process of developing a vaccine is one that is not that quick,\" Fauci told Congress last week. \"A year to a year and a half -- that is the time frame. Anyone who thinks we can go quicker than that, I think, is cutting corners.\"

As Americans brace for an extended period of uncertainty, Trump said, \"Just stay calm. It will go away.\"

\"Stay calm. It will go away.\"

Pres. Trump downplayed the coronavirus threat after meeting with GOP leaders, telling @marykbruce that \"everybody has to be vigilant and has to be careful,\" but \"a lot of good things are going to happen.\" https://t.co/maxxx28zEj pic.twitter.com/WjN0ZOOLEB

— ABC News Politics (@ABCPolitics) March 10, 2020

ABC's Chief Medical Correspondent Dr. Jennifer Ashton, however, said leaders, like doctors, need to adopt a bedside manner.

\"The most important thing is not to be dismissive or insulting and say, 'Calm down. Don't panic.' That is the last thing you say to a patient who is worried,\" Ashton said. \"What you say is, I understand how you're feeling. I'm telling you that these are the steps that we're taking right now, and I will help you through this.\"

\"PHOTO:
Al Drago/EPA via Shutterstock
PHOTO: President Donald J. Trump holds campaign rally in South Carolina, North Charleston, in Feb. 28, 2020.
>

Experts say: Warm weather won't 'miraculously' end the crisis

President Trump has also suggested that coronavirus cases will drop as the weather warms up, similar to the flu every spring.

\"There's a theory that, in April, when it gets warm, historically, that has been able to kill the virus,\" Trump said at a White House meeting in February.

He later repeated the claim at a campaign rally in South Carolina, saying \"when it gets a little warmer, it miraculously goes away.\"

Trump, at the same rally on Feb. 28, also said that Democrats were \"politicizing\" his response to the coronavirus, just as he said they had the Russia investigation and impeachment inquiry.

\"They tried anything, they tried it over and over,\" he added. \"And this is their new hoax.\"

Dr. Fauci, meanwhile, told Congress that much about the virus remains unknown.

\"We do not know what this virus is going to do,” he said. “You would hope that when we get to warmer weather, it would go down, but we can't operate under that assumption.\"

The Assistant Director-General of the World Health Organization' Polio and Emergencies Cluster Dr. Bruce Aylward isn't counting on warmer weather to stop the spread of the global outbreak.

\"I would not be betting on Mother Nature here,\" he said. \"I would be betting on case-finding.\"

ABC’s Dr. Ashton stressed that the public needs reliable information in order to make informed decisions.

\"We don't have a crystal ball here,\" Ashton said. \"I always say, in medicine and science, we have to go based on fact, not fear, and evidence, not emotion.\"

What to know about coronavirus:

Tune into ABC at 1 p.m. ET and ABC News Live at 4 p.m. ET every weekday for special coverage of the novel coronavirus with the full ABC News team, including the latest news, context and analysis.

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