World News Updates: Turkey Passes China in Confirmed Coronavirus Cases

World News Updates: Turkey Passes China in Confirmed Coronavirus Cases

President Trump said on Monday that he intended to close the United States to people trying to immigrate into the country to live and work, his most wide-ranging attempt yet to seal the country off from the rest of the world.

In recent weeks, the Trump administration has said health concerns justified moving swiftly to bar asylum seekers and undocumented immigrants from entering the country, alarming immigration activists who have said that Mr. Trump and his advisers were using a global pandemic to further hard-line immigration policies.

Mr. Trump also defended his administration’s handling of coronavirus testing, saying the nation had excess capacity even as some governors insisted that they lacked crucial materials, including nasal swabs and chemical reagents.

He framed the debates around testing in political terms, saying that Democrats wanted maximum testing “because they want to be able to criticize.” Testing has also emerged as a sticking point in negotiations between Congress and the administration on small-business aid, with Democrats pushing for a national testing strategy and Republicans, wary of placing the onus on the White House to devise and carry out such a strategy, arguing that states should set their own plans.

The Republican governors of Georgia, Tennessee and South Carolina moved to let some businesses reopen, including gyms, restaurants and beaches, though social distancing protocols will remain in effect to varying degrees. In South Carolina, for example, retail stores were told to operate at 20 percent occupancy or at five customers per 1,000 square feet, whichever is less.

The reopening announcements came as the outbreak continued to spread in parts of the nation, and modest crowds gathered to protest stay-at-home orders in several states. A prison in Ohio, the Marion Correctional Institution, is now the largest reported source of virus infections in the nation.

And although the curve is beginning to flatten in New York, the country has added more than 25,000 new cases a day for the past week, with Massachusetts particularly hard hit and clusters emerging in several other states.

As the coronavirus overwhelms the health care system, people with other illnesses are struggling to find treatment. Nearly one in four cancer patients reported delays in their care.

And in Texas, after an appeals court ruling, abortion is effectively banned in the state.

Oil prices plummeted on Monday as the economic crisis set off by the pandemic continued to destroy demand. Storage tanks in the United States that hold all the unused crude are near full capacity.

Shake Shack announced that it was returning a $10 million small-business aid loan from a federal program amid mounting criticism that large chains had been favored over smaller entities.

The Federal Reserve could soon expand its municipal bond-buying plans after announcing earlier this month its first-ever campaign to bolster the market for state and local debt.

The head of the World Health Organization’s emergencies program warned on Monday that even if a vaccine against the coronavirus were quickly developed, manufacturing and distributing it could prove extraordinarily difficult.

There is no approved treatment for or vaccine against infection with the coronavirus. More than two dozen companies have announced vaccine programs; at least three candidates already are in human trials.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, has warned that a vaccine is at least 18 months away. Other experts say even that timeline is optimistic.

The development process is important, but manufacturers must begin planning to scale up manufacturing capacities to meet global demand when a successful vaccine is discovered, said Dr. Michael Ryan, head of the W.H.O.’s emergencies program.

Billions of people around the globe eventually may need vaccination. Modern vaccines, made with DNA and RNA, require specialized facilities; it is not clear who could make them.

And it will be important that vaccines go where they are most needed, not simply to the countries that can afford them. The W.H.O. is working with government leaders and nonprofits like the Bill and Melinda Gates Foundation and the Coalition for Epidemic Preparedness Innovations to ensure that means for equitable vaccine distribution are in place when the time comes, Dr. Ryan said.

“We’ve worked for over 20 years trying to ensure that products like vaccines are distributed in emergencies on the basis of epidemiological need,” Dr. Ryan said at a news briefing. “We intend to do exactly the same here.”

The agency has a long history of distributing vaccines to countries in need, including the meningitis, yellow fever, cholera and polio vaccines. Yet mass vaccination campaigns are still logistically difficult and often met with resistance in the community.

“As a global health architecture, we’re not very good at delivering vaccines in people other than children — in adults,” Dr. Ryan said.

“If this is to work, it will require one of the greatest scientific, one of the greatest political, one of the greatest financial, one of the greatest public health operations in a generation,” he added.

For over a thousand years, Cairo’s oldest mosques kept their doors open — through the Black Death of the 14th century, the devastating cholera epidemics of the 19th century and the Spanish flu in the winter of 1918 that claimed 140,000 Egyptian lives.

Then the coronavirus hit.

On the first day of the lockdown at Al Azhar, a famed center of scholarship that opened in A.D. 972, tears flowed down the cheeks of the muezzin, Sheikh Mohamed Rashad Zaghloul, as he made the call to prayer in an empty hall.

“It was hard on my heart,” he said after midday prayers one day last week at the mosque, where a stray cat meandered between the ancient pillars. “When I call people, nobody can come. It feels like God is refusing us.”

The shuttered ancient mosques are a harbinger of another event that will be jarringly altered by the pandemic. Ramadan, the holy month of fasting, begins at the end of this week and promises this year to be the strangest experienced by any Cairene, not to mention 1.8 billion Muslims worldwide.

A sacred period that is rooted in gathering — at mosques, homes and on the streets — will be replaced with a month of solitary prayer, stifled celebrations and gnawing anxiety over the silent march of a virus that has closed a city that never, ordinarily, sleeps.

“This Ramadan is going to be flavorless,” said Abdul Rehman, 19, at the deserted lantern store he tends in Khan el Khalili, the city’s most famous bazaar.

In January, at a restaurant in Guangzhou, China, one diner infected with the novel coronavirus but not yet feeling sick appeared to have spread the disease to nine other people. One of the restaurant’s air-conditioners apparently blew the virus particles around the dining room.

There were 73 other diners who ate that day on the same floor of the five-story restaurant, and the good news is they did not become sick. Neither did the eight employees who were working on the floor at the time.

Chinese researchers described the incident in a paper that is to be published in the July issue of Emerging Infectious Diseases, a journal published by the Centers for Disease Control and Prevention. The field study has limitations. The researchers, for example, did not perform experiments to simulate the airborne transmission.

That outbreak illustrates some of the challenges that restaurants will face when they try to reopen. Ventilation systems can create complex patterns of air flow and keep viruses aloft, so simply spacing tables six feet apart — the minimum distance that the C.D.C. advises you keep from other people — may not be sufficient to safeguard restaurant patrons.

The social nature of dining out could increase the risk. The longer people linger in a contaminated area, the more virus particles they would likely inhale. Eating is also one activity that cannot be accomplished while wearing a mask. Virus-laden droplets can be expelled into the air through breathing and talking, not just through coughs and sneezes.

On the other hand, all of the people who became sick at the restaurant in China were either at the same table as the infected person or at one of two neighboring tables. The fact that people farther away remained healthy is a hopeful hint that the coronavirus is primarily transmitted through larger respiratory droplets, which fall out of the air more quickly than smaller droplets known as aerosols, which can float for hours.

Iran continued its gradual rebooting of its economy on Monday by reopening traditional bazaars and modern shopping malls and lifting travel restrictions around the country, while Iraq loosened a curfew it has had in place for nearly five weeks.

The Iranian government has called its plan “smart distancing,” rather than the strict social distancing measures imposed by most other countries hoping to flatten the rate of infection as they fight the coronavirus pandemic. But not much distancing was observed as commuters packed trains and buses and shoppers crowded the narrow, winding passageways that shape Tehran’s traditional bazaar.

President Hassan Rouhani of Iran said he was considering opening religious shrines, a potential vector for spreading the virus, two weeks earlier than scheduled based on requests from custodians of the religious centers.

Health officials in the country, one of the first outside China to be hit hard by the virus, continued to warn that another surge of patients and deaths was inevitable. Different branches of the government sent conflicting messages to the public about the pros and cons of easing restrictions while the contagion had not been contained, testing was not widely available and the numbers of patients and deaths continued to surge.

“Contact among the public has increased with the opening of shopping centers and people moving around on public transportation,” said Alireza Zali, the head of Iran’s coronavirus relief committee. There has been a steady increase in people contracting the virus and being hospitalized, Mr. Zali said, including a 2 percent increase in patients being admitted to intensive care units within the past 24 hours.

The health ministry said on Monday that 1,294 new cases were reported in the past 24 hours and that 91 people had died. Iran’s official tally stands at 5,209 people dead and 83,505 infected.

In Iraq, the decision on Monday to lift the curfew will allow some private sector workers, including those working in clothing stores and on construction sites, to return to work, along with government employees.

Iraqis will be allowed to leave their home and neighborhoods from 6 a.m. to 7 p.m. for work or for buying food or going to pharmacies or medical appointments.

“Those who are carpenters, blacksmiths, car mechanics, barbers and others are permitted to work during the day as long as no more than three people are in the establishment at one time,” the official order said. Electricians and computer store workers are also included.

Mosques will remain closed and so will restaurants, sporting events and cinemas.

Iraq has a relatively low number of cases, 1,574 as of April 20, and 82 deaths.

Reporting was contributed by Carlotta Gall, Farnaz Fassihi, Jennifer Steinhauer, Jason Schreier, Dan Levin, Alissa J. Rubin, Declan Walsh and Kenneth Chang.

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