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\begin{document}

\title{Air flow plays a key role in mitigating the COVID-19 airborne infection}



\author[1]{yoshiyasu takefuji}%
\affil[1]{Affiliation not available}%


\vspace{-1em}



  
  \date{May 21, 2024}


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\selectlanguage{english}
\begin{abstract}
WHO guidance has incorrect recommendation in Oral health care involving
AGPs. Air flow plays a key role in mitigating COVID-19 infection since
airborne particles travel by air currents.%
\end{abstract}%



\sloppy


BDA criticises misreporting of WHO guidance\textsuperscript{1}. The
document published by WHO on 3 August advocating that 'Oral health care
involving AGPs shows incorrect procedures in the wind control. According
to WHO, Aerosol-generating procedures (AGPs) are widely performed
worldwide in oral health care settings. AGPs are defined as any medical,
dental and patient care procedure that results in the production of
airborne particles \textless{}5 micrometres (\selectlanguage{greek}μ\selectlanguage{english}m) in size (aerosols),
which can remain suspended in the air, travel over a distance and may
cause infection if they are inhaled.

~

SARS-CoV-2 was named after SARS by WHO on Feb. 11
2020\textsuperscript{2}. This virus naming means that SARS-CoV-2 is very
similar to SARS-COV. Both SARS-CoV and SARS-CoV-2 use human ACE2 as
entry receptor and human proteases as entry
activators\textsuperscript{3,4,5}. In other words, SARS-CoV-2 has the
same transmission behavior as SARS-CoV. COVID-19 is an airborne
infection disease.

~

In order to avoid airborne infection of COVID-19 between a patient and
the dentist, it is necessary to control the air flow since airborne
particles often remain suspended in the air or travel by the air
currents. We need to make sure that the air flow doesn't always point
towards the body in order to prevent airborne infections. WHO did not
mention the air flow direction at all\textsuperscript{6,7}. To prevent
airborne infections, it is always necessary to keep the air flow away
from the body.

~

In order to control the air flow, we should use vacuum cleaners against
airborne viruses. A vacuum cleaner is a device that causes suction in
order to remove airborne viruses travelling from infected persons.
Always make sure keeping the air flow away from the body.

\par\null

~References:

1. BDA criticises misreporting of WHO guidance. \emph{Br Dent
J}\textbf{229,} 215 (2020). https://doi.org/10.1038/s41415-020-2088-3

2.\emph{https://www.who.int/emergencies/diseases/novel-coronavirus-2019/technical-guidance/naming-the-coronavirus-disease-(covid-2019)-and-the-virus-that-causes-it}

3. Rossi, G.A., Sacco, O., Mancino, E. \emph{et al.} Differences and
similarities between SARS-CoV and SARS-CoV-2: spike receptor-binding
domain recognition and host cell infection with support of cellular
serine proteases. \emph{Infection} (2020).

\emph{https://doi.org/10.1007/s15010-020-01486-5}

4. Sungnak, W., Huang, N., B\selectlanguage{ngerman}écavin, C. \emph{et al.} SARS-CoV-2 entry
factors are highly expressed in nasal epithelial cells together with
innate immune genes. \emph{Nat Med} \textbf{26,} 681--687 (2020).
https://doi.org/10.1038/s41591-020-0868-6

5. Renhong Yan et al., Structural basis for the recognition of
SARS-CoV-2 by full-length human ACE2, Science 27 Mar 2020: Vol. 367,
Issue 6485, pp. 1444-1448 DOI: 10.1126/science.abb2762

6. World Health Organization. Infection prevention and control during
health care when coronavirus disease (COVID-19) is suspected or
confirmed.

https://www.who.int/publications/i/item/WHO-2019-nCoV-IPC-2020.4.
Published 2020. Accessed 23 July, 2020

7. World Health Organization. Publication/Guidelines. Natural
Ventilation for Infection Control in Health-Care Settings.

https://apps.who.int/iris/bitstream/handle/10665/44167/9789241547857\_eng.pdf.
Published 2009. Accessed 23 July, 2020.

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