[코로나 연구] “COVID-19 virus evolves to be suitable for airborne transmission”… Exhale 43 to 100 times through exhalation – Reporter Kim Myung-soo

A study has found that the COVID-19 virus (SARS-CoV-2) is evolving to become more suitable for airborne transmission than the original virus as it mutates.

According to Yonhap News, Professor Don Milton’s team at the University of Maryland’s Graduate School of Public Health in the United States published a medical journal ‘Clinical Infectious Diseases’ on the 17th that the number of viruses in the exhaled breath of those infected with the COVID-19 alpha mutation were 43 to 100 times higher than that of those infected with the original virus. He said this.




The research team measured the amount of virus by collecting blood, saliva, swab samples, and 30-minute breath samples from 49 COVID-19 patients from May last year to April last year, before the delta mutation epidemic.

Next, we compared the amount of virus emitted into the air when COVID-19 patients wear a cloth mask and surgical mask closely and loosely.

As a result, it was confirmed again that Corona 19 patients exhale the Corona 19 virus during breathing.

Experimental participants measure the amount of virus in their breath using a machine developed by Professor Don Milton. [University of Nottingham 제공]

In addition, the amount of virus in the exhaled breath of those infected with the alpha mutant virus was 18 times larger than that of the virus in blood, saliva, or nasal samples.

“This suggests that the COVID-19 virus continues to change to make it more suitable for airborne transmission,” said Professor Milton.

The research team also added that the study was conducted before the spread of the delta mutation.

In an experiment in which COVID-19 patients were asked to wear a cloth or surgical mask, it was found that when the mask was applied close to the face, the amount of aerosol containing the virus emitted into the air was reduced by 50%.

There was no significant difference in the blocking effect of aerosol emission between the cloth mask and the surgical mask, however, it was found that there was little blocking effect when both masks were worn loosely.

“The important message of the paper is that there is a coronavirus in the breath you exhale, and the virus is evolving, and masks reduce the risk of spreading the virus,” said co-researcher Dr Jennifer German. It means that additional measures such as tight wearing are necessary.
Kim Myung-soo [email protected]

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