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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.

Bhopal, May 20: Two months after Deepak Bundele, an advocate and former journalist, was brutally assaulted by the Madhya Pradesh’s Betul Police on March 23, an Assistant Sub-Inspector of Kotwali Police Station in Betul district, BS Patel, approached the victim to record his statement. However, he allegedly tried to convince Bundele to withdraw the case saying that the cops had mistaken him for a Muslim since he has a long beard and assaulted him. But, the cop added, they were ashamed of the incident after they came to know that they had beaten their ‘Hindu brother’.
Bundele was on his way to the government hospital for diabetes treatment, a day before the countrywide lockdown was announced, when the assault occurred. Miffed with the incident and after the district police denied to register the case, he wrote to the State Human Rights Commission; Chief Justice of Madhya Pradesh High Court; Chief Minister Shivraj Singh Chouhan; Vivek Johri, Director General of Police, Madhya Pradesh; and SP Betul to register an FIR against the police officials and take punitive action against them.
In the wake of COVID-19 pandemic outbreak, section 144 had been imposed in Betul district and public movement was restricted when the incident had occurred. 
Talking to Bundele, ASI Patel had said, “We seek an apology on behalf of those officials [who assaulted Bundele]. We are truly embarrassed because of the incident. If you want, I can bring those officials and make them apologise in person to you. They mistook you as a Muslim and assaulted you, since you had a long beard. And the man (who assaulted you) is a kattar (staunch) Hindu…In Hindu-Muslim riots whenever a Muslim is arrested, they beat them up brutally, always,” the police official can be heard saying in an audio recording shared by the victim.
In the 14 minutes long audio, he further said, “I request to you to withdraw the complaint. Please agree to our request; understand that we are living in Gandhi’s country; we are all Gandhi’s children…I have at least 50 friends from your caste.”
The cop continued, “All those people are ashamed that they did something like this to a Hindu brother without knowing his identity. We do not have any enmity against you. Whenever there is a Hindu-Muslim riot, police always supports the Hindus; even Muslims know this. But whatever happened with you was because of ignorance. For that, I have no words.” 
Refuting ASI Patel’s claim, Bundele claimed that there was no Hindu-Muslim riot that day, and asked whether he was beaten for being wrongly identified as a Muslim. The police officials agreed, and said: “Yes, exactly.”
“When I constantly declined to withdraw the compliant, he indirectly threatened me saying, ‘Agree to our request, else you and your advocate brother will face consequences’,” Bundele claimed. 
When contacted Betul SP DS Bhadoriya said, “I’m not aware of this audio clip. I will taken strict action, if I receive any such complain.”
Bundele said that he has written to the DGP and other senior police officials with details about the incident.   
THE ASSAULT
On March 23 evening, when Bundele was on his way to a hospital for the treatment, Betul Police allegedly thrashed him. The 32-year-old advocate had worked as a journalist for various dailies in Madhya Pradesh’s state capital for a decade. He moved to Betul in 2017 and started practising in the district court with his brother. “I have been a patient of diabetes and blood pressure for the last 15 years. On March 23, since I was not feeling well, I decided to visit the hospital and get some medicines. But I was stopped by the police midway,” Bundele had said. 
Even though the advocate, who sports a beard, said that he explained to police personnel that he had to get his medicines but one of them slapped him without trying to listen to what he was saying. “When I protested and said that police have no right to beat the public, they got anxious and within no time, many police officials came and started beating me up with sticks,” he added. 
"I need constant medication and lifesaving medicines to survive and I told the policemen everything while they were assaulting me. But, they kept hitting me, even after I fell,” he said, adding, "I bled for almost a 2-3 days after the incident.”
Bundele, sustained multiple injuries and his ear bled for almost two days after the incident, but, Betul police denied to file an FIR in the incident.
‘WILL MOVE TO THE HIGH COURT’
“Even after two months of the incident, no FIR has been registered and it seems that police is trying to sweep the matter under the carpet,” Bundele said, adding, “I have talked to the Supreme Court’s veteran advocate Vivek Tankha and Etasham Hashmi and will take this matter to the court.”
He also raised serious concerns about the communal angle of the incident, saying, “It’s a matter of grave concern that the police is turning communal and targeting a particular community.”

Source: https://www.google.com/amp/s/m.thewire.in/article/communalism/madhya-pr…

United Nations, Jun 6: The coronavirus disease has not "exploded" in India, but the risk of that happening remains as the country moves towards unlocking its nationwide lockdown that was imposed in March to contain the Covid-19, according to a top WHO expert.

WHO Health Emergencies Programme Executive Director Michael Ryan on Friday said the doubling time of the coronavirus cases in India is about three weeks at this stage.

“So the direction of travel of the epidemic is not exponential but it is still growing,” he said, adding that the impact of the pandemic is different in different parts of India and varies between urban and rural settings.

“In South Asia, not just in India but in Bangladesh and...in Pakistan, other countries in South Asia, with large dense populations, the disease has not exploded. But there is always the risk of that happening,” Ryan said in Geneva.

He stressed that as the disease generates and creates a foothold in communities, it can accelerate at any time as has been seen in a number of settings.

Ryan noted that measures taken in India such as the nationwide lockdown have had an impact in slowing transmission but the risk of an increase in cases looms as the country opens up.

“The measures taken in India certainly had an impact in dampening transmission and as India, as in other large countries, open up and as people begin to move again, there's always a risk of the disease bouncing back up,” he said.

He added that there are specific issues in India regarding the large amount of migration, the dense populations in the urban environment and the fact that many workers have no choice but to go to work every day.

India went past Italy to become the sixth worst-hit nation by the COVID-19 pandemic.

India saw a record single-day jump of 9,887 coronavirus cases and 294 deaths on Saturday, pushing the nationwide infection tally to 2,36,657 and the death toll to 6,642, according to the health ministry.

The lockdown in India, was first clamped on March 25 and spanned for 21 days, while the second phase of the curbs began on April 15 and stretched for 19 days till May 3. The third phase of the lockdown was in effect for 14 days and ended on May 17. The fourth phase ended on May 31.

The country had registered 512 coronavirus infection cases till March 24.

The nation-wide lockdown in containment zones will continue till June 30 in India but extensive relaxations in a phased manner from June 8 are listed in the Union home ministry's fresh guidelines on tackling the Covid-19 pandemic issued last week.

WHO Chief Scientist Soumya Swaminathan said the over 200,000 current coronavirus cases in India, a country of over 1.3 billion people, "look big but for a country of this size, it's still modest.”

She stressed that it is important for India to keep track of the growth rate, the doubling time of the virus and to make sure that that number doesn't get worse.

She said that India is a “heterogeneous and huge country” with very densely populated cities and much lower density in some rural areas and varying health systems in different states and these offer challenges to the control of Covid-19.

Swaminathan added that as the lockdown and restrictions are lifted, it must be ensured that all precautions are taken by people.

“We've been making this point repeatedly that really if you want behaviour change at a large level, people need to understand the rationale for asking them to do certain things (such as) wearing masks,” she said.

In many urban areas in India, it's impossible to maintain physical distancing, she said adding that it then becomes very important for people to wear appropriate face coverings when they are out, in office settings, in public transport and educational institutions.

“As some states are thinking about opening, every institution, organisation, industry and sector needs to think about what are the measures that need to be put in place before you can allow a functioning and it may never be back to normal.”

She said that in many professions working from home can be encouraged but in several jobs, people have to go to work and in such cases measures must be put in place that allow people to protect themselves and others.

“I think communication and behaviour change is a very large part of this whole exercise,” she added.