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New Delhi, Feb 4: Four-month-old Mohammed Jahaan accompanied his mother almost every day to the Shaheen Bagh demonstration where he was a favourite with the protesters who would take turns to hold him and often draw the tricolour on his cheeks.

Jahaan will not be seen at Shaheen Bagh anymore. He died last week after acquiring a severe cold and congestion following exposure to the winter chill at the outdoor demonstration. His mother is, however, undeterred and determined to participate in the protests, saying it is "for the future of my children".

The infant's shattered parents, Mohammed Arif and Nazia, live in a tiny shanty put together with plastic sheets and cloth in Batla House area and have two other children -- a five-year-old daughter and a one-year-old son.

Hailing from Bareilly in UP, the couple is barely able to make ends meet. Arif is an embroidery worker and also drives an e-rickshaw. His wife helps him in his embroidery work.

"I haven't been able to earn enough in the last month despite driving the battery rickshaw in addition to my embroidery work. Now with our baby's demise, we have lost everything," he said, showing a picture of little Jahaan wearing a woolen cap that read 'I Love My India'.

A visibly disturbed Nazia said Jahaan passed away in his sleep on night of January 30 after returning from the protests.

"I had returned from Shaheen Baag at around 1 AM. After putting him and other kids to sleep, even I went to sleep. In the morning, I suddenly found him motionless. He was gone in his sleep," she said.

The couple said they took their motionless baby to the nearby Alshifa Hospital on the morning of January 31 where he was declared dead on arrival.

Nazia, who had been visiting the Shaheen Bagh demonstration everyday with Jahaan since December 18, says that he died after catching a cold that turned lethal.

She said she didn't realise that his congestion was so severe. However, the baby's death certificate issued by the hospital does not mention any specific reason for the death.

Shazia, a neighbour who was present at the couple's home, said Nazia had fought with her mother and husband to visit Shaheen Bagh everyday. Nazia would gather all women in the bylane outside her house so that they could together walk to the demonstration, around 2 km away. Sometimes, Arif would drop some of them to Shaheen Bagh on his e-rickshaw.

Nazia said she strongly feels that the CAA and NRC are against the welfare of all communities and will join the Shaheen Bagh protests, but this time without her children.

"Why was I doing this? For my children and the children of all us who need a bright future in this country," she told PTI.

"The CAA divides us on religion and should never be accepted. I don't know if there is politics involved but I know that I must question what is against the future of my children."

Arif, however, blamed the NRC and CAA for his child's death.

"Had the government not brought CAA and NRC, people would not have protested and my wife would not have joined them, my son would have been alive," he said.

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.

Dehradun, Jan 6: Universities are centres of learning and will not be allowed to become "addas" of politics, HRD Minister Ramesh Pokhriyal 'Nishank' has said.

The minister was replying to questions from reporters in Haldwani on Sunday about protests against the amended Citizenship Act across university campuses.

"Universities are centres of learning where the country's future is in the making. We cannot let them become addas of politics," Nishank said.

He accused the opposition parties of trying to turn the universities into hotbeds of politics.

The new legislation passed by Parliament aims to grant citizenship to persecuted religious minorities from Pakistan, Bangladesh and Afghanistan who had taken refuge in India and there is nothing wrong in it, the Union Minister said

"When Pakistan was created, the population of religious minorities there stood at 22 per cent. Today it is a minuscule 3.7 per cent. Persecuted on the basis of their religion, they sought sanctuary in India. The CAA is meant only to grant them citizenship," he said.

Terming the law humanitarian, the minister said it was going to make no difference to the status of Muslims in India and wondered why the Congress was making such a hue and cry about it.

Nishank's press conference in Haldwani was part of the BJP's campaign to create awareness in favour of the amended Citizenship Act.