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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.

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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.

May 7: India is projected to record the highest number of births in the 9 months since COVID-19 was declared a pandemic in March, with more than 20 million babies expected to be born in the country between March and December, according to top UN body.

The United Nations Children's Fund (UNICEF) warned that pregnant mothers and babies born during the pandemic across the world were threatened by strained health systems and disruptions in services.

An estimated 116 million babies will be born under the shadow of COVID-19 pandemic, UNICEF said on Wednesday, ahead of Mother's Day, observed on May 10.

These babies are projected to be born up to 40 weeks after COVID-19 was recognised as a pandemic on March 11.

The highest numbers of births in the 9 months since the pandemic was declared are expected to occur in India, where 20.1 million babies are projected to be born between March 11 and December 16. Other countries with the expected highest numbers of births during this period are China (13.5 million), Nigeria (6.4 million), Pakistan (5 million) and Indonesia (4 million), it said.

"Most of these countries had high neonatal mortality rates even before the pandemic and may see these levels increase with COVID-19 conditions," UNICEF said.

It is estimated that there will be 24.1 million births in India for the January-December 2020 period.

UNICEF warned that COVID-19 containment measures can disrupt life-saving health services such as childbirth care, putting millions of pregnant mothers and their babies at great risk.

Even wealthier countries are affected by this crisis. In the US, the sixth-highest country in terms of the expected number of births, over 3.3 million babies are projected to be born between March 11 and December 16.

"New mothers and newborns will be greeted by harsh realities," UNICEF said, adding they include global containment measures such as lockdowns and curfews; health centres overwhelmed with response efforts; supply and equipment shortages; and a lack of sufficient skilled birth attendants as health workers, including midwives, are redeployed to treat COVID-19 patients.

"Millions of mothers all over the world embarked on a journey of parenthood in the world as it was. They now must prepare to bring a life into the world as it has become – a world where expecting mothers are afraid to go to health centres for fear of getting infected, or missing out on emergency care due to strained health services and lockdowns," UNICEF Executive Director Henrietta Fore said.

"It is hard to imagine how much the coronavirus pandemic has recast motherhood" Fore said.

UNICEF said its analysis was based on data from World Population Prospects 2019 of the UN Population Division.

An average full-term pregnancy typically lasts a complete 9 months, or 39 to 40 weeks. For the purposes of this estimate, the number of births for a 40-week period in 2020 was calculated.

The 40-week period of March 11 to December 16 is used in this estimate based upon the WHO's March 11 assessment that COVID-19 can be characterised as a pandemic.

UNICEF warned that although evidence suggests that pregnant mothers are not more affected by COVID-19 than others, countries need to ensure they still have access to antenatal, delivery and postnatal services.

Similarly, sick newborns need emergency services as they are at high risk of death. New families require support to start breastfeeding, and to get medicines, vaccines and nutrition to keep their babies healthy, it said.

"This is a particularly poignant Mother's Day, as many families have been forced apart during the coronavirus pandemic, but it is also a time for unity, a time to bring everyone together in solidarity. We can help save lives by making sure that every pregnant mother receives the support she needs to give birth safely in the months to come," Fore said.

Issuing an urgent appeal to governments and health care providers to save lives in the coming months, UNICEF said efforts must be made to help pregnant women receive antenatal checkups, skilled delivery care, postnatal care services, and care related to COVID-19 as needed.

Ensure health workers are provided with the necessary personal protective equipment and get priority testing and vaccination once a COVID-19 vaccine becomes available so that can deliver high quality care to all pregnant women and newborn babies during the pandemic, it said.

While it is not yet known whether the virus is transmitted from a mother to her baby during pregnancy and delivery, UNICEF advised all pregnant women to follow precautions to protect themselves from exposure to the virus.

Closely monitor themselves for symptoms of COVID-19 and seek advice from the nearest designated facility if they have concerns or experience symptoms. Pregnant women should also take the same precautions to avoid COVID -19 infection as other people: practice physical distancing, avoid physical gatherings and use online health services, it said.

UNICEF said even before COVID-19 pandemic, an estimated 2.8 million pregnant women and newborns died every year, or 1 every 11 seconds, mostly of preventable causes.

The agency called for immediate investment in health workers with the right training, who are equipped with the right medicines to ensure every mother and newborn is cared for by a safe pair of hands to prevent and treat complications during pregnancy, delivery and birth.

Chandigarh, Jan 15: A man, who has killed two women over infidelity over the last 10 years was arrested from a news channel studio in Chandigarh when he confessed to these crimes during a live programme, police said.

In the television programme on News18, the 31-year-old accused, Maninder Singh, who is a cab driver, confessed killing his live-in partner, a 27-year-old nurse Sarabjit Kaur at a Chandigarh hotel on New Year's Eve.

Singh, a former murder convict and currently out on bail, also confessed about his crime committed in Karnal in 2010.

"I killed her (Sarabjit Kaur) because she was having an affair with her sister-in-law's brother," Maninder told the news channel.

Confessing his previous crime, Maninder said he had killed Renu in Karnal. "She was also having an affair with a man from Uttar Pradesh," he said.

Singh was arrested while the programme was still on air as police rushed into the studio.

Haryana Police had arrested him for killing the woman in 2010. He was convicted by a trial court, but he later got bail from the Punjab and Haryana High Court.