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Not only the new crown!
Most respiratory viruses are spread by aerosols
Science and Technology Daily, Beijing, August 29th (Intern reporter Zhang Jiaxin) The virus spread through aerosols may not only be the new coronavirus! An international interdisciplinary research team published in a review in the journal Science on the 27th that a comprehensive new assessment of respiratory viruses found that SARS virus, Middle East respiratory syndrome coronavirus, influenza virus, measles virus and The rhinovirus that causes the common cold can be spread by aerosols, which can accumulate in the indoor air and stay for several hours
.
It is generally believed that respiratory viruses, including the new coronavirus, are spread mainly through droplets produced when an infected person coughs and sneezes or through contact with contaminated surfaces
.
However, this review suggests that this traditional view may be wrong
Researchers pointed out that respiratory aerosols are formed by exhalation activities, such as breathing, talking, singing, yelling, coughing and sneezing
.
The size of aerosols largely determines how long they can stay in the air, how far they can reach, whether they can be inhaled, and if they are inhaled, how deep they can enter the respiratory tract
Studies have found that most of the aerosols produced by respiratory activity are smaller than 5 microns in size, which allows them to penetrate deep into the bronchioles and alveolar areas and deposit there
.
Studies have also found that viruses are more enriched in aerosols below 5 microns
In addition, the researchers pointed out that another unique behavior of aerosols that should be seriously considered is that their transmission capacity is affected by airflow and ventilation
.
Ensuring adequate ventilation rates, filtering and avoiding recirculation can help reduce the spread of viruses in infectious aerosols in the air
"The carbon dioxide detector helps to verify that the ventilation is adequate
.
" Jose-Luis Jimenez, an atmospheric aerosol chemist at the University of Colorado, Boulder, adds, "Install a portable high-efficiency particulate air purifier, or install it in the room upstairs.
The new crown epidemic vividly illustrates the importance of the long-underestimated air transmission route and the need to protect people to breathe clean and pathogen-free air
.
"The lessons we have learned from this pandemic have also pointed the way for us to make appropriate changes and better enter the post-epidemic era
