Coronavirus update: Money worries rise as closings spike. Get a rundown of key developments today.

Millions of Americans holed up at home against the coronavirus Monday, with many of them thrown out of work until further notice, as authorities tightened the epic clampdown and the list of businesses forced to close across the U.S. extended to restaurants, bars, gyms and casinos.

The rapid work stoppage had Americans fretting about their jobs and their savings, threatened to overwhelm unemployment benefit programs, and heightened fears the country could plunge into a recession.

The number of infections in the U.S. climbed to about 4,300, with at least 78 deaths, two-thirds of them in hard-hit Washington state, where many residents of a suburban Seattle nursing home have been cut down by the virus.

Among the latest developments today:

The White House advised people not to gather in groups of more than 10 in a set of new guidelines to fight the coronavirus outbreak released Monday, as well as asked them to stay away from bars, restaurants and food courts, and to not travel if possibleA long-awaited study in healthy people testing a potential vaccine against the new coronavirus is underway in Seattle. U.S. researchers have given a healthy volunteer the first shot of an experimental coronavirus vaccine as anxiously awaited testing opens.Stocks dived 13%, worst drop in three decades, as fears deepen that coronavirus will throw global economy into recession.Amazon says it seeks to hire 100,000 people to keep up with crush of orders, will temporarily offer $2 per hour raises. Gun sellers reported a run on arms and ammo.U.S. airlines are asking the federal government for grants, loans and tax relief that could easily top $50 billion to help them recover from a sharp downturn in travel due to the new coronavirus.The Trump administration alleged that a foreign disinformation campaign is underway aimed at spreading fear in the country amid the coronavirus pandemic, according to three U.S. officials.The Trump administration is alleging that a foreign disinformation campaign is underway aimed at spreading fear in the country amid the coronavirus pandemic, according to three U.S. officials.President Trump told governors that states should work on getting respirators and ventilators and not wait for the federal government to provide them.Mitt Romney proposed sending Americans $1,000 to deal with coronavirus downturn: “Every American adult should immediately receive $1,000 to help ensure families and workers can meet their short-term obligations and increase spending in the economy.”Actor Idris Elba said that he has tested positive for COVID-19: “Stay home people and be pragmatic. I will keep you updated on how I’m doing.”Major League Baseball pushed back opening day to mid-May at earliest.Italy announced nearly 28,000 coronavirus cases; 2,158 total dead. The number of cases rose by more than 3,000 from the day before, Italy’s Civil Protection Dept. chief says. Nearly 350 more people died.

For full reports on developments in the past 24 hours, please select from the articles below. Scroll further for a photo gallery of key events and live updates from verified social media accounts.

For most people, the new coronavirus causes mild or moderate fever and cough. It can cause more severe illness including pneumonia for some, especially older adults and people with existing health problems.

The vast majority of people recover from the new virus. According to the World Health Organization, people with mild illness recover in about two weeks, while those with more severe illness may take three to six weeks to recover.

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