Apr 03, 2020 10:55:00

It turns out that the sneezing splash reaches up to 8 meters away, and some experts claim that `` the recommended social distance should be extended from 2 meters ''

The new type of coronavirus infection (COVID-19) is a disease that spreads through

droplet infection and contact infection due to sneezing and coughing. Therefore, health organizations around the world strongly recommend that social distances be increased to more than two meters to prevent the spread of infection. However, researchers at the Massachusetts Institute of Technology (MIT) have published a study that states '2 meters is not enough.

Turbulent Gas Clouds and Respiratory Pathogen Emissions: Potential Implications for Reducing Transmission of COVID-19 | Infectious Diseases | JAMA | JAMA Network
https://jamanetwork.com/journals/jama/fullarticle/2763852

Coronavirus germs can travel up to 27 feet, MIT researcher says
https://www.usatoday.com/story/news/health/2020/03/30/coronavirus-social-distancing-mit-researcher-lydia-bourouiba-27-feet/5091526002/

Lydia Bourouiba of MIT has been studying the kinematics of breathing for many years. According to a new study published by Bourouiba, droplets ejected from the mouth when sneezing are 'gaseous clouds,' which can reach speeds of up to 10-100 meters per second, and can reach up to 8 meters away.

Looking at the following movie, you can clearly see the momentum of the droplet released from the mouth of a person.


Immediately after sneezing, these droplets scatter within a range of 50 cm from the mouth.

These droplets change to gaseous clouds and diffuse within 110 cm ...

Eventually it reaches a distance of 8 meters.

Bourouiba believes that guidelines such as the World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention say that 'viruses spread only through' large droplets ', and' large droplets 'have a limited diffusion distance.' Pointed out that based on. This result that `` large droplets change to gaseous clouds and reach up to 8 meters away '' indicates that it is necessary to revise the guidelines on the need for medical personal protective equipment (PPE) immediately Claim that

Meanwhile, Paul Pottinger, a professor of infectious disease at the University of Washington School of Medicine, points out that the problem is only large droplets. 'The biggest threat of the new coronavirus is thought to be large droplets, such as raindrops that are released from the mouth when someone sneezes,' said Pottinger. And normal flight distance is within 6 feet (1.8 meters). WHO and other rules rely on this. '