Three months in: A timeline of how COVID-19 has unfolded in the US – USA TODAY

It was three months ago Tuesday that the Centers for Disease Control and Prevention announced the first confirmed coronavirus case in the U.S.

In the weeks since, health officials have confirmed hundreds of thousands of COVID-19 cases across the nation and tens of thousands of deaths. Millions more Americans have lost their jobs, and tens of millions are living under stay-at-home orders.

As we continue to learn more about the virusand grapple with the affects of the pandemic, here's a look back on how the outbreak began, and how it has unfolded in the U.S. so far.

The CDC began implementing public health entry screening at San Francisco (SFO), New York (JFK)and Los Angeles (LAX) airports. The CDC would later add screening at two more airports Atlanta (ATL) and Chicago (ORD).

The CDC confirmed the first U.S. case of a new coronavirus that had killed six people so far in China. The Washington state man in his 30s returned from Wuhana week earlier, on Jan. 15. Nancy Messonnier, director of the National Center for Immunization and Respiratory Diseases, called the news "concerning," particularly in light of reports that the virus has begun to spread from person to person.

Chinese authorities locked down at least three cities with a combined population of more than 18 million in an unprecedented effort to contain the virusduring the busy Lunar New Year travel period.

Meanwhile, the World Health Organization declined to categorize the coronavirus as a global health emergency, saying there is no evidence of human-to-human infection outside China.

French health officials confirmed the first three cases in Europe.

In China, the Lunar New Year holiday began. Public transportation halted for roughly 36 million people in 13 cities in central China, including Wuhan. Authorities in Wuhan said they were constructing a 1,000-bed hospital like one built in Beijing during a SARS outbreak, a similar respiratory virus.

President Donald Trump thanked China on Twitterfor its efforts to contain the disease. "China has been working very hard to contain the Coronavirus. The United States greatly appreciates their efforts and transparency. It will all work out well. In particular, on behalf of the American People, I want to thank President Xi!" he said in a post.

Meanwhile, Sen. Rick Scott, R-Fla., urged the Trump administration to declare a public health emergency and sent a letter to the CDC requesting information about the agencys plan to combat the virus. "We have to get serious about the threat of coronavirus coming from China," Scott said in a press release.

Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases, comments on the risk to Americans."We don't want the American public to be worried about this because their risk is low," Fauci said."On the other hand, we are taking this very seriously and are dealing very closely with Chinese authorities."

Many health professionals argued that the flu poses a greater threat than the coronavirus.

Alex Azar, secretary of Health and Human Services and chairman of the coronavirus task force, told reporters during a press briefing that the U.S. has "been monitoring this virus and preparing a response since back in December."

The first group ofpassengers returned to the U.S. fromChina. They were expected to remain under observation for up to three days as they were screened, a CDC official said. The American passengers flew into California from Wuhan, with a stopover in Anchorage, Alaska, where they had also been screened.

The World Health Organization declared the coronavirus outbreak to be a "public health emergency of international concern." Dr. Tedros Adhanom Ghebreyesus, director-general of the WHO,praised China for its quick response to the crisis, saying the emergency declaration "is not a vote of no confidence in China."

Medical staff in protective clothes are seen carrying a patient from an apartment suspected of having the virus in Wuhan, in Hubei province on January 30, 2020.HECTOR RETAMAL, AFP via Getty Images

The CDC reportedthat thefirst case of person-to-person transmission in the U.S. is the husband of a Chicago woman who developed symptoms after visiting China. "We understand this may be concerning, but based on what we know now, our assessment remains that the immediate risk to the American public is low,"said Robert Redfield, director of the CDC.

The Trump administration declared the coronavirus outbreak to be a public health emergency in the United States, setting quarantines of Americans who have recently been to certain parts of China. CDC officials said it was the first quarantine order issued by the federal government in over 50 years.

Azar also announced a temporary suspension of entry into the United States of foreign nationals who had been in China in the previous 14 days.The ban was effective Feb. 2.

Meanwhile, officials began funneling all flights from China to the U.S. to one of seven airports that were designated ports of entry: New York, San Francisco, Seattle, Honolulu, Los Angeles, Chicago and Atlanta.

The outbreak had infected nearly 12,000 people, most of them in China, and killed more than 250 people, all in China.

A 44-year-old Chinese man hospitalized in the Philippines became the first known fatality outside China from the new virus that has killed more than 300 people.

Autopsies on the bodies of two people who died at home on Feb. 6 and Feb. 17 showed they were positive for the virus, a California county announced April 21.

Previously, the first U.S. death had been thought to occur Feb. 29 outside Seattle. The autopsy findings revealed that the virus may have been spreading in U.S. communites earlier than previously known. Thetwo people died during a time when very limited testing was available only through the CDC, and the agency's testing criteria restricted testing to only individuals with a known travel history and who sought medical care for specific symptoms.

TheChinese doctor who was reprimanded by security police for warning fellow doctors about the initial coronavirus outbreak died of the illness.

In the U.S., Secretary of State Mike Pompeo announced that his departmentfacilitated the transportation of nearly 17.8 tons of donated medical supplies to the China, including "masks, gowns, gauze, respiratorsand other vital materials."

A USA TODAY analysis later finds thatAmerican companies sold more than $17.5 million worth of face masks, more than $13.6 million in surgical garments and more than $27.2 million in ventilators to China during the first two months of the year, far exceeding that of any other similar period in the past decade.

The WHO announced a formal name for the coronavirus COVID-19. Meanwhile, China reported its highest daily coronavirus death toll, the 103 additional fatalities pushing the total past 1,100. "With 99% of cases in China, this remains very much an emergency for that country, but one that holds a very grave threat for the rest of the world," WHO'sDr. Tedros Adhanom Ghebreyesus said.

The CDC confirmed the 13th U.S. coronavirus case, and about 800 Americans evacuated from Wuhan remain under quarantine. At a rally in New Hampshire,Trumpsaidthat,"in theory" once the weather warms up,"the virus" will "miraculously" go away.

A 60-year-old U.S. citizen became what appears to be the first American fatality from the global virus outbreak. The American victim, who was not identified, died in China after being diagnosed with the coronavirus in Wuhan, according to the U.S. Embassy.

Dr. Nancy Messonnier, director of the CDC's National Center for Immunization and Respiratory Diseases, told reporters that U.S. health officials are preparing for the coronavirus to become a pandemic. "We're not seeing community spread here in the United States, yet, but its very possible, even likely, that it may eventually happen,"she said.

Schools, businesses and restaurantswere closed in a dozen northern Italian towns following reports of two deaths tied to an outbreak of the coronavirus in the region. The virus would begin to spread rapidly through Europe and Iran.

The CDC confirmed an infection in California that would represent the first U.S. person to contract the virus despite not visiting a foreign country recently or coming in contact with an infected patient. This brings the number of coronavirus cases detected in the U.S. to 15, with 12 of them related to travel and the other two to direct contact with a patient.

Meanwhile, Trump announced that Vice President Mike Pence would lead the administration's coronavirus response. "We're very, very ready for this," Trump said at a press conference. "The risk to the American people remains very low."

Messonnier told reporters that the CDChas taken steps to address problems with flawed test kits mailed to state and local labs. The agency has also expanded criteria for coronavirus testing.

In an effort to increase testing, the Food and Drug Administration announced it would be opening up its emergency authorization process to allow new testing technologies at hospitals and health care facilities nationwide.

U.S. Surgeon General Jerome Adams echoed CDC guidance encouraging Americans not to buy face masks needed by medical professionals."They are NOT effective in preventing general public from catching #Coronavirus, but if healthcare providers cant get them to care for sick patients, it puts them and our communities at risk," he said on Twitter.

A man in Washington state died after contracting the coronavirus what was initially thought to be the first death from the new disease in the U.S.Gov. Jay Inslee declared a state of emergency in Washington hours later, saying that the outbreak "could likely be a worldwide pandemic."

While touring the CDC headquarters in Atlanta, Trump told reporters: "Anybody that wants a test can get a test. Thats what the bottom line is."

Trump addressed the nation on the coronavirus outbreak andoutlined strict travel restrictions on passengers arriving in the United States from hard-hit portions of Europe. Three days later, he added the United Kingdom and Ireland to the ban.

The WHO declared that the spread of COVID-19 hadbecome a pandemic, which theorganization has definedas "the worldwide spread of a new disease." Infections outside China have increased 13-fold in two weeks, WHO's director general said. In that same time, the number of countries hit by the outbreak has tripled.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said the testing logjam constitutes a "failing" of the nation's health care system. "The idea of anybody getting (a coronavirus test) easily, the way people in other countries are doing it we're not set up for that," Faucitold Congress. "That is a failing."

Trump declared the coronavirus pandemic to be a national emergency. Trump said the movewouldfree up nearly $50 billion in additional disaster funding and would allow HHS to waive regulations and laws to deliver coronavirus testing quicker.

Trumpissued guidelines that called for Americans to avoid social gatherings of more than 10 people for the next 15 daysand to limit discretionary travel, among other guidelines. Trump said the country may be dealing with a number of restrictions through July or August as a result of the virus. He acknowledged the economy may be heading into a recession.

Trump invoked the Defense Production Act, a wartime authority that allows him to direct industry to produce critical equipment.

A study published in the New England Journal of Medicine found that viable virus could be detected up to three hours later in the air, up to four hours on copper, up to 24 hours on cardboard, and up to two to three days on plastic and stainless steel.

A CDCreportfoundthat among the roughly 12% of COVID-19 cases in the U.S. known to need hospitalizations, about 1 in 5 were among people ages 20 to 44.

China reportedno newdomestic cases on the mainland only cases in people returning from abroad.

The International Olympic Committee and Japanese government agreed to postpone the 2020 Summer Olympics "to a date beyond 2020 but not later than summer 2021" due to the ongoing coronavirus pandemic. It is the first time in modern Olympic history that a global health issue has disrupted the Games.

The U.S. surged past China and Italy to become the planet's most infected nation. More than 1,296 people had died in the U.S.

President Donald Trump signed the largest stimulus package in U.S. history.The stimulus package was expected to provide $1,200 checks to many Americans and more for families while making available hundreds of billions of dollars for companies to maintain payroll through the crisis.

Trump alsoordered his administration to use its authority under the Defense Production Act to force General Motors to expedite government contracts to build ventilators.

The CDC issued a request asking residents of New York, New Jersey and Connecticut to curtail nonessential travel for 14 days.

Meanwhile,an infant younger than one year who tested positive for the virus in Chicago died.

Trump announcedthat the White House would be extending its social distancing guidelines through April 30. "The peak in death rate is likely to hit in two weeks," Trump said. "Nothing would be worse than declaring victory before the victory is won." Trump said that he expects that, by June 1, "we will be well on our way to recovery."

The worldregisteredmore than 1 million confirmed casesin less than five months. In reality,that markwas crossed much earlier because many more people have the virus but were not tested.

In the U.S., arecord 6.65 million Americans filed first-time jobless claims the previous week, the Labor Department said. That number would later be revised up by 219,000 to an all-time high of 6.86 million.

The Trump administration advisedpeople to start wearing face masks in public to stop the spread of the coronavirus, a reversal on previous guidance that urged people not to wear masks.

The city of Wuhan was lit up after midnight to celebrate the lifting of a 76-day lockdown.

More than 2,000 people in the U.S. died of coronavirus on Good Friday, a new daily high in the nation's fight against COVID-19. Dr. Deborah Birx, coordinator of the White House coronavirus task force, said that the U.S. has not "reached the peak" of the pandemic but that there were "encouraging" signs that the curves were flattening or lowering.

The United States passed Italy to become the country with the most coronavirus deaths. However, as a proportion of the total population in the U.S., virus deaths remain at about one-sixth of those in hard-hit Italy or Spain.More than 19,700 people in the U.S. had died due to complications from the coronavirus.Worldwide, the death count surpassed 104,000.

All 50 statesreported at least one death, and more than 23,000 Americans died. President Donald Trump said his administration will "halt" funding to the WHOas it conducts a review of the global organization's handling of the pandemic.

Demonstrators drove thousands of vehiclesto Michigan's state Capitol, protesting the state'sstay-at-home order. Protests also erupted in Kentucky, Oklahoma and North Carolina.

The White House issued guidelines to states aimed at easing social distancing restrictions and reopening parts of the country. About 14% of the U.S. workforce hadfiled for unemployment in the past month.

The governors of Tennessee, South Carolina and Georgia announced various measures aimed at easing restrictions on some businesses in their states.

LabCorp, a global life sciences company based in North Carolina, received FDA authorization for kits that enable people to collect nasal swab samples at home and mail them to a laboratory for testing.

PHOTOS Getty Images, AP; GRAPHICSKarl Gelles, Jim Sergent, Mitchell Thorsonand Veronica Bravo/USA TODAY

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Three months in: A timeline of how COVID-19 has unfolded in the US - USA TODAY