NYC revises coronavirus death toll to over 10,000 with 'probable' deaths New York City cites 3,778 additional deaths as "probable" cases.

A global pandemic of the novel coronavirus has now claimed the lives of more than 126,000 people around the world.

Over 1.9 million people worldwide have been diagnosed with COVID-19, the disease caused by the new respiratory virus, according to data compiled by the Center for Systems Science and Engineering at Johns Hopkins University. The actual numbers are believed to be much higher due to testing shortages, many unreported cases and suspicions that some governments are hiding the scope of their nations' outbreaks.

Since the first cases were detected in China in December, the U.S. has become the worst-affected nation, with more than 608,000 diagnosed cases and at least 25,992 deaths.

The number of cases in New York state alone is higher than in any single country outside the U.S.

Today's biggest developments:

Cuomo responds to Trump's claim of 'total' authority over states

NYC death toll crosses 10,000 with 'probable' cases

Trump announces he will cut WHO funding

World faces worst recession since Great Depression, IMF says

7 crew members on USNS Mercy test positive for virus

Here's how the news developed on Tuesday. All times Eastern.

10:47 p.m.: Airline passenger revenues could drop by over $300 billion

The International Air Transport Association (IATA) released a new estimate Tuesday that COVID-19 could cause airline passenger revenues to drop by $314 billion in 2020. IATA's forecast is up from its $252 billion estimate on March 24 and represents a 55% drop in 2020 passenger revenue compared to 2019.

“The industry’s outlook grows darker by the day," Alexandre de Juniac, IATA’s director general and CEO said in a statement.

Treasury Secretary Steven T. Mnuchin announced earlier in the day that 10 carriers will receive stimulus money from the Payroll Support Program.

6:43 p.m.: Trump announces WHO funding suspension

President Donald Trump lashed out at the World Health Organization and announced he would cut U.S. funding to the organization, claiming it mismanaged the outbreak response.

The president specifically laid blame on the WHO's lack of support for his ban on travel from China when the outbreak began.

"They were very much opposed to what we did," he said during his daily briefing.

The president said he will have conversations with other health officials around the world about where the WHO money would go. He did not rule out restoring the money to the organization.

Trump's announcement is likely to set up a battle with Congress, which controls funding for the WHO.

The president also announced the Food and Drug Administration is authorizing a new coronavirus test from Rutgers University that uses saliva samples. Trump said Rutgers will process 10,000 tests daily.

6:25 p.m.: NYPD COVID-19 deaths surpass losses on 9/11

The New York Police Department announced it lost another member to the coronavirus.

Supervising Police Communications Technician Irving Cruz, an 18-year veteran, passed away from complications from the disease on Monday, the department said.

Cruz's death is the NYPD's 24th COVID-19 fatality, one more than the number of members who were killed on Sept. 11.

Currently, 2,232 uniformed members and 568 civilian members are diagnosed with the virus.

Also, the department said 6,372 uniformed members, roughly 17.6% of the force, were out sick Tuesday.

5:41 p.m.: Stimulus deposits completed within 4 to 5 weeks: Treasury

Treasury Department officials said they expect that direct deposit stimulus payments to all eligible Americans will be completed within four to five weeks.

The first wave of stimulus checks going out to 80 million Americans is expected to be completed by tomorrow, according to the agency.

Paper checks will begin to be sent out toward the end of the month, according to the agency.

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.

5:15 p.m.: Mnuchin announces major airlines will get money from payroll program

Treasury Secretary Steven T. Mnuchin announced that 10 major air carriers will receive stimulus money from the Small Business Association's Payroll Support Program.

The airlines include Delta, JetBlue, American and United, according to the Treasury Department.

"Treasury is also working to review and approve applications for smaller passenger air carriers as quickly as possible and will provide further guidance for cargo carriers and contractors very soon," Mnuchin said in a statement.

"This agreement will fully support airline industry workers, preserve the vital role airlines play in our economy and protect taxpayers. Our airlines are now in good shape, and they will get over a very tough period of time that was not caused by them," President Donald Trump said in the coronavirus task force briefing Tuesday.

5:05 p.m.: NYC death count revised higher by nearly 4,000

New York City's Health Department is now attributing 3,778 more deaths to the coronavirus, officially citing them as "probable" cases.

These are deaths of people -- at nursing homes, assisted living facilities and private homes -- who never received a test, but are likely to have died of coronavirus in the last month.

While these deaths have not been included in publicly announced counts until now, city health officials have been cataloging these additional people and examining their symptoms and medical histories.

"We are focused on ensuring that every New Yorker who died because of COVID-19 gets counted," New York Health Commissioner Dr. Oxiris Barbot said in a statement.

While the state is attributing 7,905 deaths in New York City to coronavirus, this tally of 3,778 more "probable" deaths pushes New York City's death toll over 10,000 and puts the statewide toll at about 15,000.

4:30 p.m.: Massachusetts plans for 'the worst case scenario'

Massachusetts Gov. Charlie Baker warned Tuesday that "our data is showing we have some very difficult days and weeks ahead."

"We are in the midst of what we believe is going to be a very difficult period for our health care community, and for our commonwealth, over the course of the next several weeks," Baker said. "We're planning for the worst case scenario."

Massachusetts' death toll climbed to 957 as of Sunday. Approximately 46% of those deaths were reported in long-term care facilities.

At the Soldiers' Home in Holyoke, Massachusetts, 44 veteran residents have died since late March. Thirty-six of those residents tested positive for coronavirus, seven of the residents who died tested negative and there is one unknown, according to a statement from the Massachusetts Office of Health and Human Services on Tuesday.

At Tuesday's news conference, Baker did not address how disproportionally the coronavirus has affected the state's long-term care facilities.

But in anticipation of the state's expected surge, Baker said his administration has been working closely with the hospital community to expand capacity.

Massachusetts has 21 testings sites, with several sites dedicated to specifically serving first responders and front line workers. In an effort to serve the vulnerable long-term care facilities, the state is also now offering mobile testing sites.

Baker added that Massachusetts will continue to expand and use the state's test-and-trace program.

3:30 p.m.: About 25% of NY deaths are from nursing home/adult care facilities

About 25% of those who have died in New York state from COVID-19 were residents of nursing homes or adult care facilities, new data shows.

At least 2,722 nursing home residents have died from the coronavirus. Queens in New York City accounts for the highest number of total deaths: 603 residents.

The elderly are among the most vulnerable to the dangerous virus.

3:10 p.m.: California's governor unveils next steps

California Gov. Gavin Newsom on Tuesday unveiled six steps the state would need to take before the stay-at-home order could be modified.

First is expanding testing by using technology, infrastructure and a trained workforce.

The second phase is protecting the most vulnerable populations, like seniors and the homeless, he said.

Third is addressing the hospital system "to meet the needs of potential surges."

"The next step is engaging academia, research partners and those on the front lines to make sure that we're advancing and continuing to promote protocols on therapeutics which are profoundly important as we bridge toward the herd immunity and the vaccine within, we hope, the next year or so," Newsom said.

After that comes "redrawing our floor plans," so when the state reaches reopening businesses and schools, there will be a plan for "safe physical distancing" inside all facilities.

The final step, Newsom said, is determining when to reinstitute certain measures.

"That's just a process that will perhaps be the most challenging if, indeed, we lean in, but we have to then lean back out as we toggle from stricter to looser interventions, back and forth as things change, as data comes in," he explained.

Newsom added that when the economy does reopen, daily activities will be different. Restaurants will open with fewer tables and disposable menus, waiters will likely wear gloves and masks, and face coverings will be common in public, he said.

1:15 p.m: Louisiana surpasses 1,000 deaths

In Louisiana, one of the hardest-hit states, the death toll from the virus surpassed 1,000 on Tuesday, reaching a total of 1,013.

"Today’s death count is the largest we have reported in a single day since this COVID-19 outbreak started," Gov. John Bel Edwards said in a statement. "They are more than just a number on a report or graph, and as our fellow Louisianans, we all grieve alongside their families."

Among the Louisianans who died were a first-term state representative and a beloved high school football coach.

The governor said that analysis showed most people passed away 11.2 days after symptoms began.

"We must look at long-term data and trends," the governor stressed.

Edwards on Tuesday also warned that "social distancing is going to be part of our future for some period of time."

"I think you're going to see your temperature taken more than it's ever been taken," he said.

The governor also moved back the state's presidential primary for a second time, now rescheduled for July 11 instead of June 20.

12 p.m.: Cuomo responds to Trump's claim of 'total' authority over states

In New York state, 778 lives were lost on Monday, bringing the total number of deaths in the state to 10,834.

Despite the grim numbers, Gov. Andrew Cuomo said Tuesday he thinks the hard-hit state has reached the apex.

Cuomo also responded to President Donald Trump's claim that he has "total" authority over states in ordering a reopening of the country.

Cuomo called that "not an accurate statement, in my opinion."

"The balance between the state and the federal ... is the essence of our democracy," Cuomo said. "We don't have a king in this country."

"The president is clearly spoiling for a fight on this issue. The worse thing we can do in all of this is start with political division," Cuomo said.

"I will not engage," Cuomo said. "I look forward to working with the president in partnership and cooperation, but he has no fight here. I won't let it happen."

11:35 a.m.: In NYC, 26 homeless people have died

In New York City, over 400 homeless individuals have tested positive for the coronavirus, including 26 people who have died.

With public bathrooms and soup kitchens largely unavailable amid the pandemic, the nightly shelter population has swelled.

To reduce density the city has spent about $200 per night to rent hotel rooms where symptomatic homeless people can be isolated.

"Six-thousand single New Yorkers, meaning single adults, will be in hotels, not traditional homeless shelters," Mayor Bill de Blasio said. "Those who will be prioritized across our shelter system for transfer to hotels, will include seniors, will include, of course, anyone with symptoms of COVID-19, or who tested positive for COVID-19."

To limit gatherings, shelters are now staggering meal times. They’re also waiving a rule that required residents to leave during cleanings to discourage them from going outside and returning potentially exposed.

10:16 a.m.: NYC producing face shields and gowns, soon to make test kits

In hard-hit New York City, companies are creating face shields and masks, and will soon be producing test kits, de Blasio said Tuesday.

Eight firms are now making 240,000 face shields per week. The companies plan to be producing 465,000 per week by April 24, and the goal is to eventually reach 620,000 per week, the mayor said.

"We will be able to fulfill our entire need for face shields right here," he said. "New York City will be self-sufficient."

Furthermore, five companies are making 30,000 surgical gowns per week in New York City. They plan to grow to 100,000 per week by April 24 ,and then the goal is to produce 250,000 per week.

"These are brand-new production lines created from scratch," which have already "surpassed expectations," de Blasio said.

But from day one, the main issue was testing, de Blasio said, and city officials "scoured the world looking for test kits on the open market," which he called an "extraordinarily frustrating" process.

De Blasio said the federal government was not providing adequate test kits.

Now, New York City will start producing its own 50,000 test kits per week, with production planning to launch in the beginning of May.

Also, Aria Diagnostics, based in Indiana, has donated 50,000 kits to the city, and New York City will buy 50,000 kits per week from them beginning April 20, said the mayor.

That will give the city access to 100,000 test kits per week.

The mayor also released the latest data on those ill with the virus.

In New York City, 326 people were admitted to hospitals on Sunday, down from 383 on Saturday. But 850 people were in intensive care units on Sunday, up from 835 on Saturday.

9:45 a.m.: Death toll over 12,000 in UK

In the United Kingdom, the coronavirus death toll has climbed to at least 12,107, according to the Department of Health and Social Care.

The U.K. has the fifth highest death toll, behind the U.S., Italy, Spain and France.

The U.K. has over 93,000 people diagnosed with COVID-19.

9:03 a.m.: World faces worst recession since Great Depression

The International Monetary Fund on Tuesday warned that the world faces its worst recession since the Great Depression of the 1930s.

In its new World Economic Outlook, the IMF now forecasts the global economy to shrink by 3% this year -- rather than expand by 3.3%, as previously projected in January -- as a result of the coronavirus pandemic. The cumulative loss to global GDP over 2020 and 2021 from the crisis could be around $9 trillion.

"It is very likely that this year the global economy will experience its worst recession since the Great Depression, surpassing that seen during the global financial crisis a decade ago," IMF chief economist Gita Gopinath said at a press conference Tuesday. "The Great Lockdown, as one might call it, is projected to shrink global growth dramatically."

The IMF, an organization of 189 countries, projects global growth in 2021 to partially recover to 5.8%, but Gopinath cautioned that "the level of GDP will remain below the pre-virus trend, with considerable uncertainty about the strength of the rebound."

"Much worse growth outcomes are possible," she said, "and maybe even likely."

7:14 a.m.: Positive cases top 15,000 in Africa

At least 15,284 people across Africa have been diagnosed with COVID-19 and 815 of them have died, according to data released Tuesday by the Africa Centers for Disease Control and Prevention.

The cases span all but two of the continent's 54 nations.

South Africa has the highest national tally with 2,272 positive cases. Egypt is not far behind with 2,190 cases, according to the Africa CDC.

The first United Nations "Solidarity Flight" is scheduled to leave Ethiopia's capital Tuesday and deliver lifesaving medical supplies across the African continent, where such supplies are desperately needed to combat the novel coronavirus. The cargo includes face shields, gloves, goggles, gowns, masks, medical aprons, thermometers and ventilators.

6:43 a.m.: France extends nationwide lockdown till May 11

French President Emmanuel Macron has extended a lockdown for his country till May 11.

Addressing the nation Monday night, Macron said he sees "hopeful signs" since imposing the nationwide lockdown on March 17 to stem the spread of the novel coronavirus.

Macron said schools will reopen "progressively," starting from May 11. However, cafes, restaurants, cinemas, concert halls, museums and hotels will remain closed and large gatherings won't be allowed until mid-July.

An announcement is expected this week on either a postponement or an outright cancellation of cycling's biggest race, the Tour de France, which is slated to kick off in Nice on June 27.

France is one of the worst-affected countries in the pandemic, with more than 137,000 diagnosed cases and nearly 15,000 deaths, according to a count kept by Johns Hopkins University.

6:21 a.m.: India extends nationwide lockdown through May 3

Indian Prime Minister Narendra Modi on Tuesday announced an extension to the nationwide lockdown for the country's 1.3 billion people.

In a televised address to the nation, Modi explained the lockdown will now remain in effect through May 3 but some restrictions on people's movement may be loosened after a week to help low-income employees and those working in the agriculture sector.

The restrictions will be relaxed only in areas that don't show any deterioration in the spread of the novel coronavirus, Modi said.

India seems to have fared well in the pandemic so far, with just over 10,500 diagnosed cases and 358 deaths, according to a count kept by Johns Hopkins University.

What to know about coronavirus:

How it started and how to protect yourself: Coronavirus explained

What to do if you have symptoms: Coronavirus symptoms

Tracking the spread in the U.S. and worldwide: Coronavirus map

5:39 a.m.: Austria and Italy reopen some shops while slowly easing lockdowns

Austria and Italy slowly began to reawaken Tuesday after a month of lockdown measures to control the spread of the novel coronavirus.

In Italy, where more than 20,000 people have died from COVID-19, a limited number of stores and small business were allowed to reopen their doors Tuesday. Shops selling books, stationary and children's clothes could reopen, along with a few specific small business and activities, including forestry, fertilizer production, wholesale paper and cardboard distribution, and computer manufacturing.

All businesses must ensure a number of safety rules, including social distancing, twice-a-day disinfection of the space, access to disinfecting gel for all workers, health information placed on front doors and masks required in all closed spaces.

Lombardy and other hard-hit regions in Italy's north have decided to maintain their restrictions for longer.

Thousands of shops reopened Tuesday in Austria, one of the first European countries to follow Italy in imposing strict measures.

Austrian chancellor Sebastian Kurz outlined a step-by-step plan last week to relax the lockdown and reopen parts of the economy, starting with non-essential shops under 4,300 square feet as well as home improvement stores and garden centers.

Social distancing measures remain in effect and Austrians are still encouraged not to leave their homes unless absolutely necessary. All shoppers are required to wear face masks.

3:30 a.m.: 7 crew members on USNS Mercy test positive for virus

A growing number of crew members aboard the USNS Mercy hospital ship docked in Los Angeles have tested positive for the novel coronavirus.

A total of seven medical treatment facility crew members have now been infected and are currently isolated off the ship, according to U.S. Navy Cmdr. John Face, a 3rd Fleet spokesman. The first positive case was confirmed on April 9.

Face said everyone who was considered to have been in close contact with the infected individuals remain in quarantine off the ship and have tested negative, with the exception of one crew member who was the fifth positive case.

"The ship is following protocols and taking every precaution to ensure the health and safety of all crew members and patients on board," Face told ABC News in a statement late Monday. "This will not affect the ability for Mercy to receive patients at this time."

After arriving in the Port of Los Angeles last month, the USNS Mercy began treating non-coronavirus patients from area hospitals to help free up resources for COVID-19 patients.

ABC News' Meg Cunningham, Ibtissem Guenfoud, Josh Hoyos, Aaron Katersky, Rachel Katz, Arielle Mitropoulos, Phoebe Natanson, Joseph Simonetti, Terrance Smith, Alex Stone, Stephanie Walsh and Christine Theodorou contributed to this report.

This report was featured in the Wednesday, April 15, 2020, episode of “Start Here,” ABC News’ daily news podcast.

"Start Here" offers a straightforward look at the day's top stories in 20 minutes. Listen for free every weekday on Apple Podcasts, Google Podcasts, Spotify, the ABC News app or wherever you get your podcasts.