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New Delhi, Jul 26: India reported a spike of 48,661 coronavirus cases in the last 24 hours, said the Union Ministry of Health and Family Welfare on Sunday.

The total COVID-19 positive cases stand at 13,85,522, including 4,67,882 active cases, 8,85,577 cured/discharged/migrated, it added.
With 705 deaths in the last 24 hours, the cumulative toll reached 32,063.

Maharashtra has reported 3,66,368 coronavirus cases, the highest among states and Union Territories in the country.

A total of 2,06,737 cases have been reported from Tamil Nadu till now, while Delhi has recorded a total of 1,29,531 coronavirus cases.

According to the Indian Council of Medical Research (ICMR), 4,42,263 samples were tested for coronavirus on Saturday and overall 1,62,91,331 samples have been tested so far.

United Nations, Apr 16: WHO chief Tedros Adhanom Ghebreyesus has welcomed the world health body's cooperation with India to leverage strategies that helped the country win its war against polio into the response to COVID-19 outbreak, saying such joint efforts will help defeat the pandemic.

The World Health Organization (WHO) has said it will work with India's Ministry of Health and Family Welfare to leverage the strategies that helped the country eradicate polio to fight the pandemic.

Migrants who returned to UP and Bihar were hurriedly housed in schools and panchayat buildings, which were turned into quarantine centres. However, unhygienic conditions and people running away have proved to be a problem

The WHO's national polio surveillance network will be engaged to strengthen COVID-19 surveillance and its field staff will continue to support immunization and elimination of tuberculosis and other diseases.

“Great news: @MoHFW_INDIA & @WHOSEARO initiated a systematic engagement of @WHO's national polio surveillance network, and other field staff, for India's #COVID19 response, tapping into the best practices & resources that helped win its war against polio,” the WHO director-general tweeted, referring to India's Ministry of Health and Family Welfare and World Health Organization Regional Office for South-East Asia.

According to the Johns Hopkins University data, over 2 million people are infected by the virus and more than 136,000 people have died of the disease globally.

Ghebreyesus expressed gratitude to Health and Family Welfare Minister Harsh Vardhan “for his leadership and collaboration” with WHO. “Through these joint efforts we can defeat the #coronavirus and save lives. Together!”

India eliminated polio in 2014.
According to a WHO press release, Vardhan said in New Delhi that “time and again the Government of India and WHO together have shown our ability, competence and prowess to the whole world. With our combined meticulous work, done with full sincerity and dedication, we were able to get rid of polio.”

“All of you in the field – IDSP (Integrated Disease Surveillance Project), state rapid response teams and WHO - are our ‘surveillance corona warriors'. With your joint efforts we can defeat the coronavirus and save lives,” Vardhan added.

WHO South-East Asia Regional Director Poonam Khetrapal Singh said the National Polio Surveillance Project (WHO-NPSP) played a critical role in strengthening surveillance for polio that generated useful, timely and accurate data to guide policies, strategies and interventions until transmission of the poliovirus was interrupted in the country,” adding that the other WHO field staff involved with elimination of tuberculosis and neglected tropical diseases and hypertension control initiative were also significant resources.

Singh added that “it is now time to use all your experience, knowledge and skills, with the same rigor and discipline that you showed while monitoring polio activities, to support districts with surveillance, contact tracing and containment activities.”

The WHO release said strengths of the NPSP team – surveillance, data management, monitoring and supervision, and responding to local situations and challenges – will be utilized to supplement efforts of National Centre for Disease Control, IDSP and Indian Council of Medical Research to strengthen COVID-19 surveillance.

The NPSP team will also support in sharing information and best practices and help states and districts calibrate their response based on transmission scenarios and local capacities.

The WHO field staff will continue to support immunization and surveillance and elimination of Tuberculosis and Neglected Tropical Diseases, Singh said, adding, “disease outbreaks can negatively impact progress in a range of areas, from maternal and child mortality to vaccine-preventable diseases and other treatable conditions. India had been making stupendous progress in these areas and we cannot afford for India's remarkable progress to be set back or reversed.”

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.