Watch the video .. the effect, strength and spread of viral coughing

Dr.. Osama Abu Al-Rub

Researchers have found that a single cough may reach its spray up to a distance of more than 3.5 meters, which raises the alarm and calls us to maintain a distance greater than currently recommended to reduce the risk of emerging coronavirus infection, at a time when another research team is working to calculate the possibility of transmission of infection from a person One injured family member.

And we start from the United States, where scientists at a laboratory at the University of Florida Atlantic studied the force of the cough and how far its components could reach, and the scientists used a doll whose mouth was filled with glycerin and water, then using a pump they made the doll cough in a way that simulated the natural human cough, and then covered the place around a green laser Color to see how the spray moves from the mouth while coughing.

Syed Verma, associate professor of engineering at the University of Florida Atlantic, told CNN that the cough fired 10-20 microns, similar to the size of the smallest spray produced when we coughed.

The scientists noted that the spray reached a distance of 3 feet (91 cm) immediately after the cough, and within 5 seconds it reached 6 feet (1.82 meters), then in ten seconds it reached 9 feet (2.74 meters), and after 30-40 seconds it reached 12 Forward (3.65 meters).

Manha Dhank, Head of Engineering Department at the University of Florida Atlantic, told CNN that the spray at a distance of 9 feet had stayed in the dormant air about two to 3 minutes, adding that the concentration of the spray is nine feet lower than six feet.

The video showed that when coughing and covering the mouth with the hand, the cough does not travel a long distance, but it spreads in all directions.

Dunk concluded by saying that the recommended 6-foot distance for social spacing - to reduce the risk of infection with the emerging coronavirus "SARS Cove 2" causing Covid-19 disease - is the minimum, and the greater the distance, the better.

The risk of transmission is
moving to France, where writer Florence Marie-Marie said in the report published by the French newspaper Le Parisien, that the results of a single study currently conducted by the Pasteur Institute in the province of Oise, showed the transmission of the virus within the same families.

Thanks to blood samples taken from high school students and their relatives, it was observed that transmission of the virus varied greatly.

For parents, the risk of infection was 9% if their child was not infected, but it reached 17%, if he was infected, and for siblings these percentages increased from 3% to 21%.

"Our homes are like miniature epidemic hotspots," said Elizabeth Buffett, a professor of infectious diseases.

For example, a woman may think that her husband was not infected, while it was he who transmitted the disease to the family, but symptoms did not appear on him, or just the opposite. Hence, home monitoring is clearly a good key to understanding the virus.

The author adds that a newly launched investigation, called Alcove 2, aims to learn more about how the virus has spread within the same family.

In this context, Amory Lambert, the team leader composed of mathematicians, statisticians and epidemiologists from the College de France and the Sorbonne University, asks, "What is the possibility of transmitting the infection to a member of my household? How many people have been infected? What is the incidence of symptoms without symptoms at home? This is what we really want to calculate. "

The author states that for scientific calculations and modeling, each family member who suffers from one or more symptoms of the disease since mid-February (whether fever, cough, loss of taste, or fatigue) was invited without making sure that it was related to Covid-19, to fill out questionnaire data. Online, it includes height, weight, chronic disease, smoking, etc., then looking at how clinical signs have evolved at home.

"The spread of the virus is the focus of this investigation," Lambert says. "I find this combination of mathematics and science very interesting. There are many criteria to consider, for example: Does joint custody increase or reduce the risk of transmission?"