narvikk/iStockBy MORGAN WINSOR, ABC News

(NEW YORK) — A pandemic of the novel coronavirus has now killed more than 286,000 people worldwide.

More than 4.1 million people across the globe 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 United States has become the worst-affected country, with more than 1.3 million diagnosed cases and at least 80,684 deaths.

Here’s how the news is developing Tuesday. All times Eastern:

4:34 a.m.: Wuhan to test entire population after cluster of cases emerge

Wuhan, the Chinese city that was ground zero of the coronavirus pandemic, plans to test its entire population for the novel coronavirus after a cluster of new cases emerged.

The Wuhan Municipal Health Commission issued an emergency notice on Monday announcing a “10 Day Battle” to ramp up its ability to conduct nucleic acid tests on the city’s 11 million residents. Each district must submit a detailed plan by Tuesday on how they will test their respective community, according to an official leaflet which has been circulated on social media and carried by state-run media.

The document did not state a timeline for the completion of the testing drive itself.

Wuhan, the capital of central China’s Hubei province, reported its first cluster of coronavirus infections on Monday in over a month, stoking fears of a second wave. The five new locally-transmitted cases arose from a previously asymptomatic patient who then spread the virus to four others in their residential compound, according to the official state-run Xinhua News Agency.

China’s National Health Commission said Tuesday morning that no new cases had been reported in Hubei province over the past 24 hours.

Wuhan was the first city in the world to go under a coronavirus-related lockdown after the newly identified virus was thought to have first emerged there in December. The lockdown was lifted last month and life in the city has slowly been returning to normal. Last week, Chinese authorities decided to downgrade the entire country from high- to low-risk for the novel coronavirus as the number of new infections continued to hover just above zero and no new deaths had been reported for several consecutive days.

But Wuhan’s Dongxihu district raised its risk level from low to medium after a new locally-transmitted case was confirmed there over the weekend, according to Xinhua News Agency.

Since the start of the pandemic, the Chinese mainland has reported 82,919 confirmed cases of COVID-19 and 4,633 deaths. There are still 115 people with the disease in hospitals, according to the National Health Commission.

3:30 a.m.: Trump and Pence to maintain distance from each other

U.S. President Donald Trump and Vice President Mike Pence will maintain a physical distance from each other in the immediate future, a senior administration official told ABC News.

The decision was made in consultation with the medical unit at the White House, the official said. The change comes after two aides on the White House campus, including Pence’s press secretary, tested positive for the novel coronavirus.

Sources had told ABC News earlier that there were discussions over the weekend about keeping the president and vice president separated, but no decision on that had been made until now. It’s unlikely the two will be attending meetings together unless necessary, sources said.

Pence spent all of Monday at the Eisenhower Executive Office Building, where he maintains his ceremonial office and where most of his staff have offices, a senior administration official told ABC News.

The Eisenhower Executive Office Building is part of the White House campus and situated adjacent to the White House building itself. Pence did not go to the White House at all on Monday, the official said.

While in the Eisenhower Executive Office Building, Pence followed the guidelines for critical infrastructure workers laid out by the U.S. Centers for Disease Control and Prevention, the official told ABC News. The vice president qualifies as a critical infrastructure worker because he’s a key member of a government entity that works to provide public health access, among other critical functions, according to the official.

Those guidelines call for people to take their temperature before going into work, monitor for any symptoms, wear a mask at all times in the workplace for 14 days after last exposure to an infected individual, maintain a six-foot distance from others and practice social distancing at work as much as possible, as well as disinfect and clean workspaces regularly.

Pence followed those guidelines as much as possible and wore a mask inside the Eisenhower Executive Office Building on Monday, the official told ABC News.

Copyright © 2020, ABC Audio. All rights reserved.