Americans, especially those who are vulnerable, may need to stop attending big gatherings as the coronavirus spreads through U.S. communities, a top health official said on Sunday, as investors braced for another volatile week in financial markets.Anthony Fauci, the head of the infectious diseases unit at the National Institutes of Health, said on NBC’s “Meet the Press” that after initial missteps distributing tests, there should be 400,000 more tests available by Monday and 4 million by the end of the week.


 Oregon Governor Kate Brown declared a 60-day state of emergency on Sunday as coronavirus cases in the state doubled to 14.


“We will do everything in our power to keep Oregonians safe,” Brown said at a news conference.


In the United States, 19 people have died out of about 450 reported cases of coronavirus, which originated in China last year and causes the sometimes deadly respiratory illness COVID-19. The outbreak has killed more than 3,600 globally.


More than half of the 50 U.S. states have reported cases, including the first cases in Virginia and Connecticut on Sunday. As the outbreak spreads, daily life has been increasingly disrupted, with concerts and conferences canceled and universities telling students to stay home and take classes online.


To contain the outbreak in China, the government quarantined millions of people for weeks. Italy has announced similar measures, locking down 16 million people in the north of the country.


As recently as Saturday, U.S. President Donald Trump said he would continue to hold his political rallies, which sometimes draw up to 20,000 people. The Democrats competing to challenge him in the Nov. 3 presidential election, U.S. Senator Bernie Sanders and former Vice President Joe Biden, have not canceled any campaign events so far.


Germany, which has nearly 1,000 cases, on Sunday urged the cancellation of all events with more than 1,000 people.


Fauci said authorities in the United States may also need to consider steps to keep people out of crowded places if the virus continued to spread.


Still, he downplayed the likelihood of the type of large-scale quarantines put in place in China and Italy, while saying nothing could be ruled out.


“I don’t imagine that the degree of the draconian nature of what the Chinese did would ever be either feasible, applicable, doable or whatever you want to call it in the United States,” he said in an interview on CBS’ “60 Minutes” that will air on Sunday night. “But the idea of social distancing, I mean, obviously, that’s something that will be seriously considered.”


He urged those most at risk to limit travel.


“If you’re a person with an underlying condition and you are particularly an elderly person with an underlying condition you need to think twice about getting on a plane, on a long trip, and not only think twice, just don’t get on a cruise ship,” Fauci said on “Meet the Press.”


U.S. Surgeon General Jerome Adams told CNN cases would rise, adding that the average age of death for people with the virus was 80, and the average age of those needing medical attention was 60.


“Unfortunately, you are going to see more deaths, but that doesn’t mean that we should panic,” he said. Communities need to “prepare for more cases so we can prevent more deaths,” Adams said.


In financial markets, talk about recessions and bear markets was growing as investors try to assess how badly the outbreak will damage global growth. Many strategists have turned more pessimistic in recent days and are anticipating further market drops and a possible end to the longest economic expansion in U.S. history.


The hardest hit place in the United States has been a nursing home in a suburb of Seattle and Washington state is considering mandatory measures such as banning large gatherings but not necessarily imposing massive quarantines, the governor said.


The cruise ship Grand Princess, barred from returning to San Francisco last week due to a coronavirus outbreak on board, will send its 2,400 passengers to at least four quarantine centers. The crew of 1,100 will be quarantined and treated on board the ship.


New York Governor Andrew Cuomo said the number of cases in New York is now 105 and he expects that to rise as testing expands.