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Turning your face only 9 times during a short conversation reduces your risk of getting COVID-19.Weather Channel-Weather Channel Articles

Turning your face only 9 times during a short conversation reduces your risk of getting COVID-19.Weather Channel-Weather Channel Articles

 


Representative image (Anindya Chattopadhyay / BCCL Delhi)

Typical image.

(Anindya Chattopadhyay / BCCL Delhi)

According to an IISc statement released Friday, turning the head 9 degrees during a short conversation reduces the risk of COVID-19 infection.

Researched by a team of researchers from the Department of Aerospace Engineering at the Indian Institute of Science (IISc), the Nordic Institute for Theoretical Physics (NORDITA) in Stockholm, and collaborators from the International Center for Theoretical Science (ICTS) in Bangalore.Published in the journal flow..

Based on their results, the team suggests that simply rotating their heads about 9 degrees to each other while maintaining eye contact can significantly reduce the risk to the speaker.

The statement explains that when a person sneezes or coughs, droplets carrying a virus, such as SARS-CoV-2, can infect others nearby. Does talking to an infected person also increase the risk of infection? How do speech droplets or “aerosols” move in the air among interacting people?

To answer these questions, the research team ran computer simulations to analyze the movement of voice aerosols.

The team visualized a scenario in which two unmasked people stood 2, 4, or 6 feet apart and talked to each other for about a minute. Next, we estimated the rate and extent of diffusion of the speech aerosol from one location to another.

Their simulations showed that if one person acted as a passive listener and did not engage in two-way conversation, the risk of infection was higher. Factors such as the height difference of the person speaking and the number of aerosols released from the mouth also appear to play an important role in viral infection.

“Speaking is a complex activity, and when people speak, they are not really aware of whether this can constitute a means of viral infection,” said the assistant professor of the Department of Aerospace Engineering and the corresponding author. Says Sourabh Diwan, who is alone.

In the early days of the COVID-19 pandemic, experts believed that the virus was symptomatically spread mainly by coughing and sneezing. Over time, it became clear that asymptomatic infections also led to the spread of COVID-19. However, according to Diwan, few studies have considered voice aerosol transport as a possible mode of asymptomatic infection.

To analyze the flow of audio, he and his team modified the computer code they initially developed to study the movement and movement of cumulus clouds. This is a puffy cotton-like cloud commonly found on sunny days.

The code (called Megha-5) was written by the other corresponding author of this paper, S. Ravichandran of NORDITA. It was recently used by RamaGovindarajan’s group at ICTS to study particle-flow interactions.

An analysis conducted by the team on the flow of speech included the possibility of the virus invading through the eyes and mouth when determining the risk of infection. Most studies to date have considered only the nose as a point of entry.

“The computational part was intensive and it took a lot of time to perform these simulations,” explains Rohit Singhal, lead author and PhD student in the Department of Aerospace Engineering.

Diwan adds that it is difficult to numerically simulate the flow of audio aerosols due to the highly variable (“turbulent”) nature of the flow. Factors such as mouth flow and duration of speech also play a role in shaping its evolution.

In the simulation, if the speakers are the same height or significantly different in height (one height, one short), the risk of infection is much higher than if the height difference is medium. Turned out to be low. The fluctuation looked like a bell. curve.

In the future, the team will focus on simulating the difference in loudspeaker voice and the presence of surrounding ventilation sources to see how they can affect virus transmission. I will win.

They also plan to discuss with public health policy makers and epidemiologists to develop appropriate guidelines. “Whatever precautions you can take while returning to normal with your daily interactions with others, it will greatly help minimize the spread of the infection,” says Diwan.

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The above article was published by the Wire Agency with minimal changes to the headline and text.

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