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The coronavirus can stay aloft for hours in tiny droplets in stagnant air, infecting people as they inhale, mounting scientific evidence suggests.

This risk is highest in crowded indoor spaces with poor ventilation, and may help explain superspreading events reported in meatpacking plants, churches and restaurants.

It’s unclear how often the virus is spread via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech.

Follow latest updates on the Covid-19 pandemic here

Aerosols are released even when a person without symptoms exhales, talks or sings, according to Marr and more than 200 other experts, who have outlined the evidence in an open letter to the World Health Organization.

What is clear, they said, is that people should consider minimizing time indoors with people outside their families. Schools, nursing homes and businesses should consider adding powerful new air filters and ultraviolet lights that can kill airborne viruses.

What does it mean for a virus to be airborne?

For a virus to be airborne means that it can be carried through the air in a viable form. For most pathogens, this is a yes-no scenario. HIV, too delicate to survive outside the body, is not airborne. Measles is airborne, and dangerously so: It can survive in the air for up to two hours.

For the coronavirus, the definition has been more complicated. Experts agree that the virus does not travel long distances or remain viable outdoors. But evidence suggests it can traverse the length of a room and, in one set of experimental conditions, remain viable for perhaps three hours.

How are aerosols different from droplets?

Aerosols are droplets, droplets are aerosols — they do not differ except in size. Scientists sometimes refer to droplets fewer than 5 microns in diameter as aerosols. (By comparison, a red blood cell is about 5 microns in diameter; a human hair is about 50 microns wide.)

From the start of the pandemic, the WHO and other public health organizations have focused on the virus’s ability to spread through large droplets that are expelled when a symptomatic person coughs or sneezes.

These droplets are heavy, relatively speaking, and fall quickly to the floor or onto a surface that others might touch. This is why public health agencies have recommended maintaining a distance of at least 6 feet from others, and frequent hand washing.

But some experts have said for months that infected people also are releasing aerosols when they cough and sneeze. More important, they expel aerosols even when they breathe, talk or sing, especially with some exertion.

Scientists know now that people can spread the virus even in the absence of symptoms — without coughing or sneezing — and aerosols might explain that phenomenon.

Because aerosols are smaller, they contain much less virus than droplets do. But because they are lighter, they can linger in the air for hours, especially in the absence of fresh air. In a crowded indoor space, a single infected person can release enough aerosolized virus over time to infect many people, perhaps seeding a superspreader event.

For droplets to be responsible for that kind of spread, a single person would have to be within a few feet of all the other people, or to have contaminated an object that everyone else touched. All that seems unlikely to many experts: “I have to do too many mental gymnastics to explain those other routes of transmission compared to aerosol transmission, which is much simpler,” Marr said.

Can I stop worrying about physical distancing and washing my hands?

Physical distancing is still very important. The closer you are to an infected person, the more aerosols and droplets you may be exposed to. Washing your hands often is still a good idea.

What’s new is that those two things may not be enough. “We should be placing as much emphasis on masks and ventilation as we do with hand washing,” Marr said. “As far as we can tell, this is equally important, if not more important.”

Should I begin wearing a hospital-grade mask indoors? And how long is too long to stay indoors?

Health care workers may all need to wear N95 masks, which filter out most aerosols. At the moment, they are advised to do so only when engaged in certain medical procedures that are thought to produce aerosols.

For the rest of us, cloth face masks will still greatly reduce risk, as long as most people wear them. At home, when you’re with your own family or with roommates you know to be careful, masks are still not necessary. But it is a good idea to wear them in other indoor spaces, experts said.

As for how long is safe, that is frustratingly tough to answer. A lot depends on whether the room is too crowded to allow for a safe distance from others and whether there is fresh air circulating through the room.

What does airborne transmission mean for reopening schools and colleges?

This is a matter of intense debate. Many schools are poorly ventilated and are too poorly funded to invest in new filtration systems. “There is a huge vulnerability to infection transmission via aerosols in schools,” said Don Milton, an aerosol expert at the University of Maryland.

Most children younger than 12 seem to have only mild symptoms, if any, so elementary schools may get by. “So far, we don’t have evidence that elementary schools will be a problem, but the upper grades, I think, would be more likely to be a problem,” Milton said.

College dorms and classrooms are also cause for concern.

Milton said the government should think of long-term solutions for these problems. Having public schools closed “clogs up the whole economy, and it’s a major vulnerability,” he said.

“Until we understand how this is part of our national defense, and fund it appropriately, we’re going to remain extremely vulnerable to these kinds of biological threats.”

What are some things I can do to minimize the risks?

Do as much as you can outdoors. Despite the many photos of people at beaches, even a somewhat crowded beach, especially on a breezy day, is likely to be safer than a pub or an indoor restaurant with recycled air.

But even outdoors, wear a mask if you are likely to be close to others for an extended period.

When indoors, one simple thing people can do is to “open their windows and doors whenever possible,” Marr said. You can also upgrade the filters in your home air-conditioning systems, or adjust the settings to use more outdoor air rather than recirculated air.

Public buildings and businesses may want to invest in air purifiers and ultraviolet lights that can kill the virus. Despite their reputation, elevators may not be a big risk, Milton said, compared with public bathrooms or offices with stagnant air where you may spend a long time.

If none of those things are possible, try to minimize the time you spend in an indoor space, especially without a mask. The longer you spend inside, the greater the dose of virus you might inhale.

Washington, May 22: The deadly coronavirus came from China and the US is not going to take it lightly, American President Donald Trump said on Thursday.

"It came from China. We are not happy about it. We just signed a trade deal, the ink wasn't dry and all of the sudden this floated in. We are not going to take it lightly,” Trump said participating in a Listening Session with African-American Leaders in Michigan.

Trump in the last several weeks has been very critical of China's inability to control the spread of the novel coronavirus within its territory. By Thursday more than 94,000 Americans have died due to the coronavirus and over 1.6 million have tested positive.

He has so far not given any indication of the steps that he is contemplating taking against China.

Meanwhile, pressure is building on his administration, mainly from the Republican lawmakers on this.

On Thursday, Senators Ted Cruz and Rick Scott, along Mike Braun, Marsha Blackburn, Joni Ernst, Martha McSally and Tom Cotton, introduced the COVID-19 Vaccine Protection Act to prevent the Chinese Communist Party from stealing or sabotaging American COVID-19 vaccine research.

The bill requires a thorough national security evaluation and clearance by the Department of Homeland Security, the Department of State, and the Federal Bureau of Investigation of all Chinese student visa holders taking part in activities related to COVID-19 vaccine research.

"The same Chinese Communist Party that covered up the coronavirus outbreak also routinely engages in state sponsored theft of intellectual property," Cruz said. "We cannot allow China to steal or interfere with American research and development of a vaccine,” he added.

"Communist China is responsible for the coronavirus pandemic, and their lies and misinformation cost American lives," Scott said.

"We cannot let Communist China off the hook for this, and we absolutely cannot allow Communist China to steal or sabotage any American research efforts related to the Coronavirus vaccine. The COVID-19 Vaccine Protection Act protects American efforts to create a vaccine as we work to end this pandemic," he added.

The COVID-19 Vaccine Protection Act, among others requires an enhanced vetting of nationals of the Chinese nationals in the US as nonimmigrants under F, J, or M student visas to determine if any student visa holders are a national security threat.

Once the review is complete, authorizes Department of Homeland Secretary, in consultation with other agencies, to continuously monitor all nonimmigrant student visa holders (F, M, J) who are Chinese nationals while in the US and are engaged in, or have access to, the research of any potential COVID-19 vaccine or COVID-19 related material.

Republican Whip and Ranking Member of the Select Subcommittee on the Coronavirus Crisis Steve Scalise alleged that China lied to the world on coronavirus.

"During a critical period in December and January, China withheld evidence of the virus: evidence that confirmed human to human transmission of the virus, evidence of the extent of the spread. China refused entry of American and other medical experts from around the world for weeks,” he said.

“And during this time, China hoarded medical supplies like masks, gowns, and other life-saving PPE. Chinese exports of surgical masks, gowns, and gloves were stifled by the Chinese Communist Party during this period. China knew the danger posed by the virus and while they hid the truth, they used the time to stock up on vital medical supplies,” Scalise said.

“While Chinese authorities limited domestic flights from Wuhan to other Chinese cities like Beijing and Shanghai, China's government urged international carriers to maintain their flight schedules — seeding the virus throughout the rest of the world,” he alleged.

Mar 16: An investigation into Coffee Day Enterprises Ltd., initiated by its board after the death of founder V.G. Siddhartha, is likely to conclude that at least Rs 2,000 crore is missing from its accounts, according to people familiar with the matter.

The months-long probe following the suicide of Siddhartha in July examined the financial transactions of India’s largest coffee chain and its dealings with dozens of private companies owned by the entrepreneur. The draft report, running more than a hundred pages, points to thousands of rupees that have gone missing, said the people, asking not to be named because the details aren’t public. It also details hundreds of transactions between the founder’s listed and personal businesses that were not conducted at arm’s length, they said.

Though the report is in its final stages, the precise details could change before its release, expected as early as this week, the people said. The missing funds could total more than Rs 2500 crore, one person said.

“The investigation report is still a work in progress, and not finalized,” a spokesman for the company said. “The board of directors and the company are unaware of its content at this point of time. Hence it would be premature to speculate on the investigation findings.”

The priority for management and Siddhartha’s family “is to keep the business running in a challenging environment and meet all stakeholder commitments, including 30,000 jobs associated with the group,” the spokesman added.

The disappearance of the 59-year-old founder last year stunned India’s business community. He had last been seen telling his driver he was going for an evening walk along a bridge in southern India; his body was found by local fishermen two days later. A letter delivered to Coffee Day’s board and employees, which appeared to be signed by Siddhartha, described massive debts and complained of pressure from lenders and tax authorities. It claimed he bore sole responsibility for the company’s financial transactions.

The probe began about a month later when the company brought in Ashok Kumar Malhotra, a retired senior official from India’s federal enforcement agency, to investigate. A senior lawyer practicing in India’s top court is assisting, the company said in a regulatory filing at the time.

The publicly traded Coffee Day was supposed to be India’s answer to Starbucks Corp. More than 1,500 of its Café Coffee Day outlets blanketed cities and highways, with affordable options for the country’s aspiring middle classes. The chain’s tagline: “A lot can happen over coffee.”

But the empire has been battered since the founder’s death. Its shares plummeted about 90% and its market value dropped to about $80 million. Trading was suspended in February.

India’s regulators are tracking the situation and may use the company’s final report as part of a deeper dive into its internal affairs, the people said. Coffee Day showed about Rs 2400 crore in cash and cash equivalents on its balance sheet as of March 2019, the most recent figures the company has issued.

After the death of Siddhartha however, the company faced a severe liquidity crunch and had “zero cash in the bank,” according to one of the people. It struggled with day-to-day expenses and paying salaries has been a strain, the person said.

The draft report details personal guarantees by Siddhartha for loans taken by Coffee Day, and his unsecured loans at high interest rates from local money lenders, the people said. It also probes Coffee Day’s defaults to coffee growers and other vendors, they said.

A related issue is that coffee estates owned by Siddhartha and several employees had been used as collateral for bank loans. The report found that valuations for properties were inflated to get the loans, one person said.

Investigators have examined several theories about what happened to the company’s money, including whether Coffee Day was manipulating its finances to show cash and profit and whether Siddhartha was taking cash out of the listed company to pay off a large investor to whom he had guaranteed a return, the person said. From the filings of his listed and private companies, the entrepreneur’s loans had totaled more than Rs 10,000 crore, and he had been squeezed by borrowing to repay interest on earlier loans, the person said.

In the letter purportedly from Siddhartha, the entrepreneur said he had tried his best but failed as an entrepreneur. “I am solely responsible for all mistakes,” the letter read. “Every financial transaction is my responsibility. My team, auditors and senior management are totally unaware of all my transactions. The law should hold me and only me accountable, as I have withheld this information from everybody including my family.”

As the report nears release, Coffee Day is finalizing a deal with Blackstone Group Inc. for real estate assets. A large tranche of the payment is due in about a week, one person said.

Coffee Day said it is working to reduce its debt load by divesting non-core enterprises.

“The aim is to save employment and preserve this iconic Indian brand,” the spokesman said.