Collaborating Authors

Seeing is believing: Effectiveness of facemasks


Currently, there are no specific guidelines on the most effective materials and designs for facemasks to minimize the spread of droplets from coughs or sneezes to mitigate the transmission of COVID-19. While there have been prior studies on how medical-grade masks perform, data on cloth-based coverings used by the vast majority of the general public are sparse. Research from Florida Atlantic University's College of Engineering and Computer Science, just published in the journal Physics of Fluids, demonstrates through visualization of emulated coughs and sneezes, a method to assess the effectiveness of facemasks in obstructing droplets. The rationale behind the recommendation for using masks or other face coverings is to reduce the risk of cross-infection via the transmission of respiratory droplets from infected to healthy individuals. Researchers employed flow visualization in a laboratory setting using a laser light sheet and a mixture of distilled water and glycerin to generate the synthetic fog that made up the content of a cough-jet.

Homemade cotton masks can prevent 99.9% of coronavirus droplets from spraying into the air

Daily Mail - Science & tech

More evidence has emerged that wearing masks can prevent an infected person from spreading the novel coronavirus to others. A new study found that homemade cotton face coverings stop 99.9 percent of contagious droplets from spraying into the air when someone coughs or speaks - and surgical masks prevented 100 percent of droplets. Tests showed a person standing six feet away from someone without a mask was up to 1,000 times greater risk of inhaling droplets than someone standing 1.5 feet away from a coughing person wearing a mask. What's more, even the homemade single-layer cotton mask reduced the number of infectious droplets by more than 1,000-fold. The team, from the University of Edinburgh's Roslin Institute in the UK, says the findings show the importance of wearing a face covering in public so that, if you are infected with COVID-19, you are not sickening others.

Coronavirus can be spread by speaking but is stopped by face masks

Daily Mail - Science & tech

Any form of cloth mouth cover, including a mask, can stop coronavirus spreading via invisible saliva droplets when an infected person talks, a study has found. Previous wisdom has said coughing or sneezing poses the highest chance of passing on the SARS-CoV-2 virus -- which causes the disease COVID-19 -- because they expel nasal or bronchial secretions, where the virus is known to be abundant. But coronavirus can also be spread in tiny speech droplets that are invisible to the naked eye, scientists from the National Institutes of Health in Maryland, US, claim. Speaking causes thousands of speech droplets to spray outwards every minute and scientist say it is likely this spreads the coronavirus. Writing in the study, the researchers say: 'Our results suggest that speaking can indeed be a major mode of SARS-CoV-2 transmission.'

Infected Tube passenger showers coronavirus droplets by talking

Daily Mail - Science & tech

A person infected with coronavirus can pass it on just by talking to someone in a closed environment such as a tube train or small office, simulations reveal. In a simulation of Tube travel, produced by software firm MSC, one infected person can be seen literally coating other passengers with COVID-19 - just by talking. Researchers found that someone chatting to a friend on the tube can'coat others' with the deadly coronavirus - even if they don't sneeze or cough. The new model looking at ways droplets from breath spread in enclosed spaces comes as Britain prepares to return to work, school and a level of normality after lockdown. Public transport has become busier as people return to work and children prepare to return to school.

The most and least effective coronavirus face masks, according to new study

FOX News

Fox News Flash top headlines are here. Check out what's clicking on Looking to update your coronavirus face mask? A recent study has identified the most and least effective face coverings, with one face mask in particular claiming the No.1 spot for being the most effective at curbing the spread of COVID-19. Researchers at Duke University compared 14 commonly available masks and face coverings to see which was most effective at stopping the spread of respiratory droplets.