Airborne route and bad use of ventilation systems as non-negligible factors in SARS-CoV-2 transmission

3 月 25, 2022World News


The world is facing a pandemic of unseen proportions caused by a corona virus named SARS-CoV-2 with unprecedent worldwide measures being taken to tackle its contagion. Person-to-person transmission is accepted but WHO only considers aerosol transmission when procedures or support treatments that produce aerosol are performed. Transmission mechanisms are not fully understood and there is evidence for an airborne route to be considered, as the virus remains viable in aerosols for at least 3 h and that mask usage was the best intervention to prevent infection. Heating, Ventilation and Air Conditioning Systems (HVAC) are used as a primary infection disease control measure. However, if not correctly used, they may contribute to the transmission/spreading of airborne diseases as proposed in the past for SARS. The authors believe that airborne transmission is possible and that HVAC systems when not adequately used may contribute to the transmission of the virus, as suggested by descriptions from Japan, Germany, and the Diamond Princess Cruise Ship. Previous SARS outbreaks reported at Amoy Gardens, Emergency Rooms and Hotels, also suggested an airborne transmission. Further studies are warranted to confirm our hypotheses but the assumption of such way of transmission would cause a major shift in measures recommended to prevent infection such as the disseminated use of masks and structural changes to hospital and other facilities with HVAC systems.

Keywords: Aerosol; COVID-19; HVAC; SARS-Cov-2; Ventilation.

Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.


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    1. Coronavirus disease (COVID-2019) situation reports. 2020. (Accessed 26th of February 2020, at….).
    1. Wang D, Zhou M, Nie X, Qiu W, Yang M, Wang X, et al. Epidemiological characteristics and transmission model of Corona Virus Disease 2019 in China. J Infect [Internet]. 2020 Mar; Available from: – PMC – PubMed
    1. Leung CC, Lam TH, Cheng KK. Mass masking in the COVID-19 epidemic: people need guidance. Lancet (London, England) [Internet]. 2020;395(10228):945. Available from: – PMC – PubMed
    1. Shiu EYC, Leung NHL, Cowling BJ. Controversy around airborne versus droplet transmission of respiratory viruses. Curr Opin Infect Dis [Internet]. 2019 Aug;32(4):372–9. Available from: – PubMed
    1. Han Q., Lin Q., Ni Z., You L. Uncertainties about the transmission routes of 2019 novel coronavirus. Influenza Other Respi Viruses. 2020:1–2.


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