Doctor’s Note: Can coronavirus spread through the air?
4 years, 9 months ago

Doctor’s Note: Can coronavirus spread through the air?

Al Jazeera  

A doctor explains what we know about how the coronavirus is transmitted – and what we do not. We know that the virus’s main route of transmission from one person to another is through droplets which are sneezed or coughed out by infected people. However long the virus can last, while it is in the air in droplets, anyone within two metres of the cough or sneeze can breathe it in and become infected. The virus may also remain airborne in much tinier droplets, according to some emerging evidence published in the same journal this week by scientists at Princeton University, University of California Los Angeles and the US research agency, the National Institutes of Health – though not in significant quantities. This means the virus remains suspended in the air in very tiny water droplets – smaller than the ones coughed or sneezed – long after larger droplets have fallen to surfaces or been breathed in.

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History of this topic

Shocking new British research show Covid-19 CAN be spread by infected surfaces
1 year, 8 months ago

Shocking new British research show Covid-19 CAN be spread by infected surfaces

Daily Mail  

British researchers have discovered that Covid-19 may be spread via surfaces after all. In the early days of the pandemic, a lack of concrete knowledge about how the virus spread saw widespread use of antibacterial wipes on surfaces and sanitiser gels to keep hands clean. But a new study by scientists at Imperial College London suggests surfaces can still hold …

Coronavirus is airborne, confirms study
2 years, 8 months ago

Coronavirus is airborne, confirms study

Deccan Chronicle  

HYDERABAD: Novel Coronavirus is airborne and you could contract it just by breathing infected air, even when you maintain social distancing, confirms a new study. They found that the virus could be frequently detected in air around Covid patients. We found that the positivity rate of finding the virus in air was 75 per cent when two or more Covid …

More evidence of airborne spread of COVID: study
2 years, 8 months ago

More evidence of airborne spread of COVID: study

The Hindu  

The SARS-CoV-2, which was earlier thought to spread through touching infected surfaces, has been found to be spreading airborne and more evidence is coming up in this regard, with epidemiologists also finding that countries that used masks were affected less severely by the pandemic. Scientists analysed the coronavirus’ genome content from air samples collected from different areas occupied by COVID …

Covid is airborne — but preventing airborne spread is perfectly doable. Here’s how to do it
2 years, 11 months ago

Covid is airborne — but preventing airborne spread is perfectly doable. Here’s how to do it

The Independent  

Sign up to our free Living Well email for advice on living a happier, healthier and longer life Live your life healthier and happier with our free weekly Living Well newsletter Live your life healthier and happier with our free weekly Living Well newsletter SIGN UP I would like to be emailed about offers, events and updates from The Independent. …

Coronavirus loses ability to infect within 20 min in air, first five minutes most dangerous: Study
2 years, 11 months ago

Coronavirus loses ability to infect within 20 min in air, first five minutes most dangerous: Study

India Today  

The SARS-CoV-2, responsible for the coronavirus pandemic, loses its capability to infect within 20 minutes of becoming airborne. However, it's the first five minutes that does all the damage, according to a new study that mapped the time a virus survives in exhaled air. "A decrease in infectivity to 10 per cent of the starting value was observable for SARS-CoV-2 …

Coronavirus Becomes 90% Less Infectious Within 20 Minutes of Being Airborne, Reveals UK Study
2 years, 11 months ago

Coronavirus Becomes 90% Less Infectious Within 20 Minutes of Being Airborne, Reveals UK Study

News 18  

A groundbreaking new study that attempts to find how the deadly coronavirus survives in exhaled air has revealed that the virus becomes 90 per cent less infectious within 20 minutes of becoming airborne therefore losing most of its ability to infect after the first five minutes. While conducting the study, the researchers developed an apparatus to generate virus-containing particles and …

Covid: How to sanitise and stay safe while flying
3 years, 3 months ago

Covid: How to sanitise and stay safe while flying

The Independent  

Sign up to Simon Calder’s free travel email for expert advice and money-saving discounts Get Simon Calder’s Travel email Get Simon Calder’s Travel email SIGN UP I would like to be emailed about offers, events and updates from The Independent. The new peer-reviewed study published in September used data from nearly 10,000 air travellers on Delta’s Covid-tested flight corridors between …

Little risk of picking up coronavirus on a plane: NLR
3 years, 6 months ago

Little risk of picking up coronavirus on a plane: NLR

Dutch News  

Sitting in a plane fewer than four rows away from with someone who is infected with coronavirus will result in only a very minor chance of infection, according to research by the Dutch aerospace institute NLR and public health body RIVM for the transport ministry. At between one in 160 and one in 1800 cases, the risk of catching the …

Coronavirus more likely to spread indoors through maskless interaction: Study
3 years, 7 months ago

Coronavirus more likely to spread indoors through maskless interaction: Study

Deccan Chronicle  

Washington: Speaking in indoor spaces without wearing a mask poses the greatest risk of spreading SARS-CoV-2, the virus that causes COVID-19, to others, a study has found. The research, published in the Journal of Internal Medicine on Tuesday, describes how different sized respiratory droplets emitted while speaking have a range of sizes, and can carry different amounts of virus. "When …

Coronavirus more likely to spread indoors through maskless interaction: Study
3 years, 7 months ago

Coronavirus more likely to spread indoors through maskless interaction: Study

India TV News  

Speaking in indoor spaces without wearing a mask poses the greatest risk of spreading SARS-CoV-2, the virus that causes COVID-19, to others, a study has found. The research, published in the Journal of Internal Medicine on Tuesday, describes how different sized respiratory droplets emitted while speaking have a range of sizes, and can carry different amounts of virus. "When the …

Aerosols from Covid-19 infected person can travel in air upto 10 metres: Govt
3 years, 7 months ago

Aerosols from Covid-19 infected person can travel in air upto 10 metres: Govt

Hindustan Times  

The government on Thursday issued a set of guidelines to stop the spread of the coronavirus disease as the country reels under the second wave of the pandemic. Stopping the transmission of the Covid-19 virus from a person to another person will decrease the infection rate of the disease to a level where it can eventually die, according to the …

Aerosols carrying Covid-19 virus can travel in air up to 10 meters: Centre
3 years, 7 months ago

Aerosols carrying Covid-19 virus can travel in air up to 10 meters: Centre

Deccan Chronicle  

New Delhi: Cautioning people to maintain social distance to prevent the transmission of the Covid-19 virus, the office of the Principal Scientific Adviser to the Government of India on Thursday said that aerosols, one of the key transmission mode of the SARS-CoV-2, can travel in the air up to 10 meters. "Aerosols and droplets are key transmission mode of the …

COVID-19 infection is transmitted via air, says US CDC
3 years, 8 months ago

COVID-19 infection is transmitted via air, says US CDC

India TV News  

Exposure to respiratory fluids -- very fine respiratory droplets and aerosol particles -- present in air and which carry viruses are the main reason for contracting Covid-19 infection, the US Centers for Disease Control and Prevention said. These droplets carry viruses and transmit infection, said the agency's latest science brief as part of its public guidelines on Covid-19. Exposure to …

Coronavirus is airborne. Experts give 10 reasons in support
3 years, 8 months ago

Coronavirus is airborne. Experts give 10 reasons in support

Hindustan Times  

SARS-CoV-2, the virus which causes the coronavirus disease, is predominantly transmitted through the air, according to a new study published in The Lancet journal. The experts pointed out that superspreading events account for substantial SARS-CoV-2 transmission, saying “such events may be the pandemic's primary drivers.” “Detailed analyses of human behaviours and interactions, room sizes, ventilation, and other variables in choir …

Virus infections predominantly by air: Lancet
3 years, 8 months ago

Virus infections predominantly by air: Lancet

Deccan Chronicle  

Hyderabad: Making the worst fears about how Covid-19 spreads and how the disease-causing SARS-CoV-2 travels from one person to another, a study published by Lancet, the venerated medical journal, has said that the virus spreads “predominantly by the airborne route.” In their study, published by Lancet on April 15, researchers from the US, Canada and the United Kingdom, said there …

Catching COVID-19 from surfaces is very unlikely, maybe we should ease up on the constant disinfecting
3 years, 10 months ago

Catching COVID-19 from surfaces is very unlikely, maybe we should ease up on the constant disinfecting

Firstpost  

This isn’t to say surface transmission isn’t possible and that we should disregard it completely but, we should acknowledge the threat is relatively small. The key question isn’t whether surface transmission is possible, or whether it can occur in the real world — it almost certainly can. The virus that causes COVID-19 can survive on banknotes, glass and stainless steel …

IIT Bombay claims Covid-19 survives longer on glass, plastic than cloth or paper
3 years, 10 months ago

IIT Bombay claims Covid-19 survives longer on glass, plastic than cloth or paper

Hindustan Times  

The novel coronavirus may survive for far lesser time on porous surfaces such as paper and clothes than on impermeable surfaces like glass and plastic, a study by researchers from the Indian Institute of Technology Bombay suggests. IIT Bombay study claims coronavirus survives longer on glass, plastic Covid-19, caused by the SARS-CoV-2 virus, is transmitted through respiratory droplets. "Based on …

The novel coronavirus does not like porous surfaces
3 years, 10 months ago

The novel coronavirus does not like porous surfaces

Live Mint  

It is a well-known fact that one of the primary modes of transmission of the covid-19 virus is through respiratory droplets. Now a new study by researchers at the Indian Institute of Technology Bombay, published recently in the Physics of Fluids journal, shows that a droplet remains liquid for a much shorter time on a porous surface, making it less …

‘Infectious’ coronavirus particles may remain on surfaces longer as temperatures drop: Study
4 years ago

‘Infectious’ coronavirus particles may remain on surfaces longer as temperatures drop: Study

Hindustan Times  

Scientists have used virus-like particles to predict how environmental factors affect the survival of the novel coronavirus on surfaces, and found that the Covid-19 virus may remain infectious longer as temperatures drop in winter. According to the study, published in the journal Biochemical and Biophysical Research Communications, virus-like particles, or VLPs, “faithfully mimic the external structure of the SARS-CoV-2 virus.” …

Coronavirus Can Survive on Surfaces for Days by Transforming into a Microscopic Pancake-like Film
4 years, 1 month ago

Coronavirus Can Survive on Surfaces for Days by Transforming into a Microscopic Pancake-like Film

News 18  

According to a new study, the virus responsible for Covid-19 can remain infectious on most of the surfaces for several days as it transforms itself into a microscopic pancake-like film after the water content in the particle has evaporated. The researchers have also noted that the conversion sees more than 99.9 percent of the droplet’s liquid content vanish within a …

The Coronavirus Is Airborne Indoors. But We’re Still Scrubbing Surfaces.
4 years, 1 month ago

The Coronavirus Is Airborne Indoors. But We’re Still Scrubbing Surfaces.

News 18  

At Hong Kong’s deserted airport, cleaning crews constantly spray baggage trolleys, elevator buttons and check-in counters with antimicrobial solutions. But scrubbing surfaces does little to mitigate the virus threat indoors, experts say, and health officials are being urged to focus instead on improving ventilation and filtration of indoor air. But scientific evidence was growing that the virus could stay aloft …

Covid-19 pandemic: Ventilate, open windows to cut risk, advises UK government
4 years, 1 month ago

Covid-19 pandemic: Ventilate, open windows to cut risk, advises UK government

Hindustan Times  

The Boris Johnson government on Wednesday released a new film based on research that shows ventilation and letting in fresh air into indoor spaces can reduce risk of infection from the coronavirus by over 70%. The film produced with scientists at Leeds University illustrates how coronavirus lingers in the air in spaces with no fresh air, increasing the risk of …

Plasma jets may kill novel coronavirus within seconds: Study
4 years, 1 month ago

Plasma jets may kill novel coronavirus within seconds: Study

India TV News  

Plasma jets may kill the novel coronavirus on surfaces such as metal, leather, and plastic in as a little as 30 seconds, according to a study which suggests that plasma could promise a significant breakthrough in the fight against the spread of Covid-19. Published in the journal Physics of Fluids, the modelling study conducted in June showed strains of the …

Plasma Jets May Kill Coronavirus on Metal, Leather Surfaces Within Seconds: Study
4 years, 1 month ago

Plasma Jets May Kill Coronavirus on Metal, Leather Surfaces Within Seconds: Study

News 18  

Plasma jets may kill the novel coronavirus on surfaces such as metal, leather, and plastic in as a little as 30 seconds, according to a study which suggests that plasma could promise a significant breakthrough in the fight against the spread of COVID-19. Published in the journal Physics of Fluids, the modelling study conducted in June showed strains of the …

Coronavirus survives on human skin for nine hours: Study
4 years, 2 months ago

Coronavirus survives on human skin for nine hours: Study

Hindustan Times  

The coronavirus remains active on human skin for nine hours, Japanese researchers have found, in a discovery they said showed the need for frequent hand washing to combat the Covid-19 pandemic. The pathogen that causes the flu survives on human skin for about 1.8 hours by comparison, said the study published this month in the Clinical Infectious Diseases journal. “The …

Modern aircraft ventilation systems aren’t spreading viruses, DoD study suggests
4 years, 2 months ago

Modern aircraft ventilation systems aren’t spreading viruses, DoD study suggests

CNN  

CNN — A new study released Thursday suggests that people don’t need to worry about circulating air spreading coronavirus on airplanes. The US Department of Defense study supports earlier research showing the ventilation systems on aircraft filter the air efficiently and take out particles that could transmit viruses. The US Transportation Command, The Defense Advanced Research Project Agency and the …

Coronavirus May Spread More Via Respiratory Droplets in Winter, Say Scientists
4 years, 2 months ago

Coronavirus May Spread More Via Respiratory Droplets in Winter, Say Scientists

News 18  

While transmission of the novel coronavirus as small aerosol particles is more significant in summer, direct contact with respiratory droplets may be more pronounced in the winter months, according to a new research. ”We found that in most situations, respiratory droplets travel longer distances than the 6-foot social distance recommended by the CDC,” said Yanying Zhu, a co-author of the …

Covid-19 Causing Virus Can Stay on Mobile Screens, Glass and Money for 28 Days: Study
4 years, 2 months ago

Covid-19 Causing Virus Can Stay on Mobile Screens, Glass and Money for 28 Days: Study

News 18  

Three recommendations for controlling the spread of the novel coronavirus include washing hands with soap and water, maintaining social distance and wearing masks. In a recent study published in the Virology Journal on 7th October 2020, it was found that SARS-CoV-2 virus can survive on glass surfaces, stainless steel and currency notes for up to 28 days. COVID-19 virus can …

How long can coronavirus survive on surface? It's 28 days, says new study
4 years, 2 months ago

How long can coronavirus survive on surface? It's 28 days, says new study

India Today  

Researchers have said that Covid-19 that causes the novel coronavirus infection, can survive for 28 days on smooth surfaces such as stainless steel, phone screens, glass, plastic and banknotes. Contrary to previous research that suggested Covid-19 can survive for three to seven days on smooth surfaces, the recent study by researchers at Australian agency CSIRO says that the virus can …

Novel Coronavirus Can Survive on Skin for 9 Hours, Much Longer Than Flu Viruses: Study
4 years, 3 months ago

Novel Coronavirus Can Survive on Skin for 9 Hours, Much Longer Than Flu Viruses: Study

News 18  

The SARS-CoV-2 virus, which causes COVID-19, may linger on human skin for nine hours, much longer than the flu viruses can, according to a study. The influenza A virus, in contrast, remained viable on human skin for nearly two hours, said the researchers including those from Kyoto Prefectural University of Medicine in Japan. “We generated a model that allows the …

Novel coronavirus can survive on skin for 9 hours: Study
4 years, 3 months ago

Novel coronavirus can survive on skin for 9 hours: Study

India TV News  

The SARS-CoV-2 virus, which causes COVID-19, may linger on human skin for nine hours, much longer than the flu viruses can, according to a study. The influenza A virus, in contrast, remained viable on human skin for nearly two hours, said the researchers including those from Kyoto Prefectural University of Medicine in Japan. "We generated a model that allows the …

For How Long Can the Coronavirus Stay Active on Your Skin and Other Surfaces?
4 years, 3 months ago

For How Long Can the Coronavirus Stay Active on Your Skin and Other Surfaces?

News 18  

Despite all the strides made by humankind over the last few months, the COVID-19 pandemic is far from over. Research conducted at the United States Army Medical Research Institute of Infectious Diseases in July 2020 had indicated that SARS-CoV-2 can stay on the skin for eight hours to 14 days depending on the temperature. This study said that the virus …

Covid-19 can spread through virus in air, confirms US CDC
4 years, 3 months ago

Covid-19 can spread through virus in air, confirms US CDC

India Today  

Covid-19 can spread through virus lingering in the air, sometimes for hours, the US Centers for Disease Control and Prevention has said as it acknowledged concerns voiced by public health experts about the airborne transmission of the virus. Read: Jamia Millia Islamia researchers develop saliva-based home testing kit CDC said under such circumstances, scientists believe the amount of infectious smaller …

CDC says coronavirus can spread indoors in updated guidance
4 years, 3 months ago

CDC says coronavirus can spread indoors in updated guidance

Associated Press  

NEW YORK — The top U.S. public health agency said Monday that the coronavirus can sp However, several experts faulted the updated Centers for Disease Control and Prevention guidance. In interviews, CDC officials have also acknowledged growing evidence that the virus can sometimes spread on even smaller particles called aerosols that spread over a wider area. CDC officials called those …

The CDC says the coronavirus can spread through tiny airborne particles after all
4 years, 3 months ago

The CDC says the coronavirus can spread through tiny airborne particles after all

LA Times  

The U.S. Centers for Disease Control and Prevention acknowledged Monday that the coronavirus can spread through microscopic respiratory particles known as aerosols that float in the air for minutes or even hours before being inhaled. On its website, the CDC said that even people who followed social distancing guidelines have been infected through this type of transmission — and added …

Can the coronavirus travel more than 6 feet in the air?
4 years, 3 months ago

Can the coronavirus travel more than 6 feet in the air?

Associated Press  

Can the coronavirus travel more than 6 feet in the air? People spray liquid droplets of various sizes when they cough, sneeze, talk, sing, shout and even just breathe. The advice about staying at least 6 feet apart is based on the idea that the larger particles drop to the ground before getting very far. For aerosols, “6 feet is …

CDC acknowledges risk of coronavirus aerosols in new guidelines, then reverses course
4 years, 3 months ago

CDC acknowledges risk of coronavirus aerosols in new guidelines, then reverses course

LA Times  

New federal guidelines that acknowledged the role of aerosols in the spread of COVID-19 were removed Monday from the website of the Centers for Disease Control and Prevention, which said they had been posted by mistake. Read the CDC’s draft guidance on the role of coronavirus aerosols in the spread of COVID-19 These are the guidelines about COVID-19 spread that …

CDC says coronavirus spreads mainly in the air, through respiratory aerosols and droplets
4 years, 3 months ago

CDC says coronavirus spreads mainly in the air, through respiratory aerosols and droplets

LA Times  

The coronavirus spreads most commonly in the air, through droplets or other tiny respiratory particles that apparently can remain suspended and inhaled, the Centers for Disease Control and Prevention says in new guidance. Science & Medicine UPDATE: CDC says new guidance on aerosols was posted by mistake The Centers for Disease Control and Prevention said new guidance that warned about …

Tiny coronavirus particles could travel a lot further than 1.5 metres in the air, study suggests
4 years, 4 months ago

Tiny coronavirus particles could travel a lot further than 1.5 metres in the air, study suggests

ABC  

The critical importance of social distancing due to the risk of tiny airborne particles of COVID-19 has been largely focused on scientific advice that airborne spray could travel up to 1.5 metres. Key points: ANU researchers say particles 50 times smaller than hair can travel several metres ANU researchers say particles 50 times smaller than hair can travel several metres …

High Humidity Can Extend Lifetime of Coronavirus-laden Droplets by 23 Times: Study
4 years, 4 months ago

High Humidity Can Extend Lifetime of Coronavirus-laden Droplets by 23 Times: Study

News 18  

High humidity can extend the airborne lifetime of medium-sized virus-laden droplets by as much as 23 times, according to a study which suggests that maintaining physical distancing would significantly remediate the spread of COVID-19. "If the virus load associated with the droplets is proportional to the volume, almost 70 per cent of the virus would be deposited on the ground …

Scientists warn on flu & COVID-19: Says Influenza viruses can spread through dust, non-respiratory particles
4 years, 4 months ago

Scientists warn on flu & COVID-19: Says Influenza viruses can spread through dust, non-respiratory particles

India TV News  

Influenza viruses can spread through the air on dust, fibres and other microscopic particles, and not just expiratory droplets, according to a study published on Tuesday that has implications for the novel coronavirus transmission. Influenza virus is thought to spread by several different routes, including in droplets exhaled from the respiratory tract or on secondary objects such as door handles …

What Should We Still Be Cleaning And Disinfecting To Prevent COVID-19?
4 years, 4 months ago

What Should We Still Be Cleaning And Disinfecting To Prevent COVID-19?

Huff Post  

LOADING ERROR LOADING The sales of disinfecting sprays and wipes skyrocketed in recent months as the public scrambled to more frequently disinfect commonly touched surfaces and items that could spread the coronavirus. “Relative to other things that one might want to do, such as wearing a mask, avoiding large gatherings and maintaining distance from other people, the importance of disinfecting …

Infectious coronavirus particles found in hospital air add to mounting evidence of airborne transmission
4 years, 4 months ago

Infectious coronavirus particles found in hospital air add to mounting evidence of airborne transmission

Firstpost  

The significant concentrations of virus found in hospital aerosols highlight the need to follow precautions like improved ventilation, experts said. “It’s unambiguous evidence that there is infectious virus in aerosols.” A research team at the University of Florida succeeded in isolating live virus from aerosols collected at a distance of seven to 16 feet from patients hospitalized with COVID-19 — …

Here\'s how to make your car corona free
4 years, 5 months ago

Here\'s how to make your car corona free

Deccan Chronicle  

With motor vehicles getting back on the roads in large numbers as a result of the relaxed lockdown restrictions, the Greater Chennai Corporation administration has urged automobile owners to strictly follow precautionary measures to contain the spread of COVID 19. In a short video, GCC has asked vehicle owners to follow tips including cleaning of oft-touched surfaces such as the …

Coronavirus and surfaces: What's the latest on what we know about how you can catch COVID-19?
4 years, 5 months ago

Coronavirus and surfaces: What's the latest on what we know about how you can catch COVID-19?

ABC  

Are you more likely to catch coronavirus from surfaces or from droplets in the air? Under experimental conditions it found: The virus could still be detected on stainless steel and plastic after 72 hours No viable SARS-CoV-2 could be detected on a cardboard surface after 24 hours No viable SARS-CoV-2 could be detected on a copper surface after four hours …

Can the coronavirus spread through the air?
4 years, 5 months ago

Can the coronavirus spread through the air?

Associated Press  

Can the coronavirus spread through the air? The World Health Organization recently acknowledged the possibility that COVID-19 might be spread in the air under certain conditions. Recent COVID-19 outbreaks in crowded indoor settings — restaurants, nightclubs and choir practices — suggest the virus can hang around in the air long enough to potentially infect others if social distancing measures are …

Even good ventilation removes only 10% of coronavirus particles from classrooms, study finds
4 years, 5 months ago

Even good ventilation removes only 10% of coronavirus particles from classrooms, study finds

Daily Mail  

Even with good ventilation, only a small fraction of the novel coronavirus may be filtered out from a room, a new study suggests. In a simulated classroom scenario, in which an asymptomatic teacher speaks for 50 minutes, just 10% of aerosols were filtered out and the rest were stuck to walls. Pictured: Students chat behind a plastic partition in a …

How do people catch coronavirus? What we know so far
4 years, 5 months ago

How do people catch coronavirus? What we know so far

Live Mint  

The modus operandi is becoming clearer. For the most part, SARS-CoV-2, the coronavirus that causes Covid-19, spreads by close personal contact via tiny particles emitted when an infected person coughs, sneezes, speaks, sings -- or even just breathes normally. Patients may harbor potentially infectious SARS-CoV-2 virus in their saliva, stool, and urine as long as 15 days after falling ill, …

WHO: Indoor airborne spread of coronavirus possible
4 years, 5 months ago

WHO: Indoor airborne spread of coronavirus possible

Associated Press  

LONDON — The World Health Organization is acknowledging the possibility that COVID-19 might be spread in the air under certain conditions — after more than 200 scientists urged the agency to do so. In an open letter published this week in a journal, two scientists from Australia and the U.S. wrote that studies have shown “beyond any reasonable doubt that …

WHO will review claims of airborne transmission of Coronavirus made by health experts from 32 countries
4 years, 6 months ago

WHO will review claims of airborne transmission of Coronavirus made by health experts from 32 countries

Firstpost  

WHO guidance to health workers, dated 29 June, says SARS-CoV-2 is primarily transmitted through respiratory droplets and on surfaces. The World Health Organization is reviewing a report urging it to update guidance on the novel coronavirus after more than 200 scientists, in a letter to the health agency, outlined evidence the virus can spread in tiny airborne particles. “I think …

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