Coronavirus Live Updates: Moderna and N.I.H. Begin Vaccine Trial

A test of a late-stage vaccine will enroll people at 89 sites around the United States.

One of the first large studies of safety and effectiveness of a coronavirus vaccine in the United States began on Monday morning, according to the National Institutes of Health and the biotech company Moderna, which collaborated to develop the vaccine.

The study, a Phase 3 clinical trial, is to enroll 30,000 healthy people at about 89 sites around the country. Half will receive two shots of the vaccine, 28 days apart, and half will receive two shots of a saltwater placebo. Neither the volunteers nor the medical staff giving the injections will know who is getting the real vaccine.

Researchers will then monitor the subjects, looking for side effects and waiting to see if significantly fewer vaccinated people get Covid-19, indicating that the vaccine works. The main goal is to determine whether the vaccine can prevent the illness. The study will also try to find out if it can prevent severe Covid-19 and death; if it can prevent infection entirely, based on lab tests; and if just one shot can prevent the illness.

Earlier tests of the vaccine showed that it stimulated a strong immune response, with minor and transient side effects like sore arms, fatigue, achiness and fever. But exactly what type of immune response is needed to prevent the illness is not known, so phase 3 studies are essential to determine whether a vaccine really works.

In a statement, Dr. Francis Collins, the director of the N.I.H., said, “Having a safe and effective vaccine distributed by the end of 2020 is a stretch goal, but it’s the right goal for the American people.” He said that despite the unprecedented speed in bringing this experimental vaccine to human testing, “the most stringent safety measures” were being maintained.

Moderna said in a statement that it would be able to deliver about 500 million doses per year, and possibly up to a billion doses per year, starting in 2021. The company, which has received about half a billion dollars from the government to develop a coronavirus vaccine, says it will not sell the vaccine at cost, but for profit.

The vaccine uses a synthetic version of genetic material from part of the coronavirus, encased in tiny particles made of fat that help it get into human cells. The genetic material, called messenger RNA or mRNA, then prompts the cells to churn out a tiny piece of the virus, which the immune system sees as foreign, and learns to recognize. If the person is later exposed to the real virus, the immune system will attack.

Messenger RNA has not yet produced any approved vaccines, but other companies have also invested in the approach, because of its potential to produce vaccine quickly. The government announced last week that it had made a $1.95 billion deal to buy 100 million doses of an mRNA vaccine made by Pfizer, in partnership with a German company, BioNTech. That vaccine is also expected to begin Phase 3 trials this month, and the government will buy it only if the trial proves it safe and effective. Curevac and Sanofi are also working on mRNA vaccines.

Adults interested in participating in the Moderna trial can visit or and search identifier NCT04470427.

With Kentucky officials set to announce stricter measures on Monday to contain the coronavirus, a top federal health official suggested that the leaders of nearby states should take a hard look at doing the same.

On a visit to Kentucky on Sunday, Dr. Deborah L. Birx, the Trump administration’s coronavirus response coordinator, said several states in the region should reinstate bar closures and restrictions on public gatherings to quell the rise of infections.

“We do believe that there are states that do need to close their bars, to decrease indoor gatherings to less than 10 and to decrease social gatherings to less than 10 to really make it possible to control the pandemic before it gets worse,” Dr. Birx said at a news conference.

Several states in the South and Midwest are facing the prospect of shutting down parts of their economy again to try to stem the virus, which the Trump administration and many governors have increasingly been forced to recognize as unrelenting. As some states turn to new restrictions to try to stem the spread, Larry Kudlow, the president’s economic adviser, said Sunday on CNN that the administration would “lengthen” the eviction moratorium which was set to expire at the end of July.

Florida has surpassed New York, an early epicenter of the pandemic in the United States, in the number of cases, and four states have set single-day records for infections: Louisiana, Tennessee, Oklahoma and Alaska.

On her visit to Kentucky, Dr. Birx cited as worrisome not just that state but also Indiana, Ohio, Tennessee and Virginia. She said the federal health authorities were concerned about the percentage of people who were testing positive for the virus, as well as the total number of cases.

Top Trump administration officials proposed on Sunday potentially short-circuiting free-ranging stimulus talks with Democrats to rush through a much narrower bill prioritizing an extension of federal unemployment benefits that are set to expire this week for millions of Americans.

Mark Meadows, the White House chief of staff, said he would now like to see lawmakers act this week to extend and alter the unemployment program, give tax credits to businesses to help ease reopening costs and grant employers new liability protections — while setting aside a long list of other objectives, including Democrats’ priorities.

“Perhaps we put that forward, get that passed, as we can negotiate on the rest of the bill in the weeks to come,” Mr. Meadows said on ABC’s “This Week.”

The proposal, echoed by Treasury Secretary Steven Mnuchin in his own Sunday morning interview, was a last-ditch effort by Republicans to prevent the program from lapsing as signs mounted that the nation’s economy was once again weakening amid a resurgence of coronavirus cases.

With Democrats already on record in opposition to a piecemeal approach, a narrow fix is almost certainly dead on arrival. Republicans know that, suggesting their Sunday proposal may in part be a negotiating tactic laying the groundwork to blame the opposition party when the funds ultimately expire.

Democrats passed their own $3 trillion proposal — which also includes money to bail out states and cities, fully fund the $600 additional federal jobless benefit and infuse billions more into the nation’s health care system — in May and view the time pinch now as a problem of Republicans’ making that only gives them more leverage in shaping a final bill.

“We’ve been anxious to negotiate for two months and 10 days,” Speaker Nancy Pelosi said on Sunday on the CBS program “Face the Nation.” She said Congress could not leave town for its annual August recess until a deal was

How do you keep people safe from a pandemic when a hurricane is bearing down?

Battling diabetes and H.I.V., he knew that catching the virus could kill him, so he had been living alone on the docked boat for three months.

“I had managed to stay safe all this time, but the storm kicked me out of my boat,” Mr. Howe said. “Now here I am, back on land, on borrowed time.”

Here’s what else is happening with the coronavirus response in the United States:

Dozens of flights have been added, but the evacuation is expected to take at least four days. The evacuees are mostly local tourists; Vietnam remains closed to incoming foreign tourists.

Health officials began expanded screening and testing in Danang, a popular tourist destination, after a 57-year-old man tested positive for the fourth time on Saturday, the government said. The infections of three additional people on Sunday, including a 61-year-old man requiring a ventilator, prompted the evacuation.

Officials said it was unclear whether all four patients had the same source of infection.

Vietnam has been among the world’s most successful countries in containing the virus. It closed down international borders early in the crisis, called for widespread use of masks, and rapidly began strict quarantine and contact-tracing measures. There have been 420 cases and no deaths, according to a New York Times database.

But the case of the 57-year-old-man, who had not traveled outside Danang and rarely left home in the previous month, alarmed Vietnam’s residents, who are being asked to wear masks again after becoming more lax in recent months.

Several countries that had the virus under control have had to sharpen their response after a sudden uptick in cases. In June, China reimposed restrictions in Beijing after a flare-up ended a 56-day run of no locally transmitted cases. Officials in Australia locked down much of Melbourne in early July after restrictions had been eased for months. But Japan has shied away from new restrictions even as cases broke records last week.

In other news from around the world:

  • Often criticized for a slow response to the coronavirus, the government in Britain moved quickly this weekend to impose a 14-day quarantine on anyone arriving from Spain, after a spike in coronavirus cases there. The rapid move brought disarray to thousands of Britons, blindsiding those already traveling and embarrassing Britain’s transportation secretary, Grant Shapps, who is responsible for aviation policy but learned of the quarantine while on vacation. In Spain.

  • Officials in Hong Kong, which reported a record 145 new cases on Monday and has had more than 100 new cases for six days in a row, said on Monday that they would shut down all dine-in restaurant service, limit public gatherings to two people and require masks in public at all times. Hong Kong is coping with its worst outbreak yet after having the virus largely under control from mid-April to July.

  • The government of Morocco locked down eight cities on Sunday before the Eid al-Adha holiday. People are prohibited from leaving or entering Berrechid, Casablanca, Fez, Marrakesh, Meknes, Settat, Tangier and Tetouan, except under specific conditions. The lockdown is open-ended. The decision comes after a week of rising coronavirus cases in the North African kingdom and is aimed at containing the virus during a holiday when Moroccans travel across the country to visit family. Over the weekend, the authorities also tightened the control of the mask mandate and fined and even arrested people who didn’t wear their masks outside of their homes. Morocco has had 20,278 cases and 313 deaths from the virus.

  • The health minister of the Mexican state of Chihuahua, Dr. Jesus Grajeda, died nearly two weeks after being hospitalized with Covid-19, Reuters reported. Announcing the death on Sunday on Facebook, Chihuahua’s governor, Javier Corral, expressed “profound sadness.”

In Zambia, 15 lawmakers tested positive for the virus.

The latest count of new coronavirus cases was jarring: Some 1,500 virus cases were identified three consecutive days last week in Illinois, and fears of a resurgence in the state even led the mayor of Chicago to shut down bars all over town on Friday.

But at the same moment, there were other, hopeful data points that seemed to tell a different story entirely. Deaths from the virus statewide are one-tenth what they were at their peak in May. And the positivity rate of new coronavirus tests in Illinois is about half that of neighboring states.

“There are so many numbers flying around,” said Dr. Allison Arwady, the commissioner of the Chicago health department. “It’s hard for people to know what’s the most important thing to follow.”

Six months since the first cases were detected in the United States, more people have been infected by far than in any other country, and the daily rundown of national numbers on Friday was a reminder of a mounting emergency: more than 73,500 new cases, 1,100 deaths and 939,838 tests, as well as 59,670 people currently hospitalized for the virus.

Mr. Moss said he recently rode by a Manhattan theater and suddenly began wondering if it, too, would disappear soon. “And then I pushed it aside,’ he said, ”because it’s just too much right now. It’s overwhelming.”

Reporting was contributed by Stephen Castle, Emily Cochrane, Nicholas Fandos, Julie Bosman, Troy Closson, Denise Grady, Choe Sang-Hun, Tiffany May, Raphael Minder, Richard C. Paddock, Edgar Sandoval, Eileen Sullivan, Neil Vigdor and Daniel Victor.

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