Covid-19: Wearing a mask to counter the virus

Whether in times of influenza or viruses such as the current CoVid-19, understanding is key to adopting the right behaviours.

Covid-19: Wearing a mask to counter the virus

First of all, it is necessary to understand how a virus works in order to take the right actions and limit its spread. 

A virus is a very small particle, 0.02 to 0.3 µm in size (for larger viruses). This microscopic infectious particle can only replicate itself by entering a cell and using its cellular machinery.

Viruses are not cells but infectious particles with the ability to pass through filters usually used to stop bacteria. Virions are almost never free outside the human body. The virus is transported by microdroplets, which are blocked by fibers.

A person infected with CoVid-19 produces billions and billions of viruses (virions or viral particles) that are released into the air through sneezing, coughing, talking, screaming and singing.  

In all bacterial or viral lung infections, human-to-human contagion or contamination occurs from invisible G-particles (microdroplets) that form an aerosol.

The recommended modes of prevention are : 

- Wearing masks to avoid airborne transmission to other people around us. 

- Wash your hands regularly during the day. 

- Respect barrier gestures

Our advice: Trace elements and vitamins to strengthen his immunity and boost his body!

Concretely, which masks for which filtration?

Filtration is essential to judge the effectiveness of a mask but also its tightness.

Qualification of the particles:

- PM10 particles suspended in the air, with an aerodynamic diameter (or aeraulic diameter) of less than 10 micrometers. Finer particles can be referenced :

- PM2.5 with a diameter of less than 2.5 micrometers, called "fine particles".

- PM1.0 with a diameter of less than 1.0 micrometer, called "very fine particles".

- PM0.1 with a diameter of less than 0.1 micrometer, called "ultrafine particles" or "nanoparticles".

So to be effectively protected against viruses, a minimum classification of PM2.5 is necessary. However, it is important to know that a coronavirus is smaller since it measures about 0.1 micron. But the virus is always carried at least on a microdroplet which, whatever its size, will be stopped by the filter. The virus will then be trapped in the fibers. 

What is also important is the filtration percentage of the particles. There are two categories: to protect those around you (surgical) or to protect the person wearing the mask (FFP). To better understand filtration, you can click here.

Our filters are made up of several filtering layers that offer a very effective protection against particles (PM1 to PM0.3) since they filter at 99.9%. They also protect against pollen, dust, and certain other viruses and bacteria.

The Stratus's sealing system can be adjusted at the nose, the barrette is adjustable and the mask must fit the face. The Sirocco range has a patented thermoformable foam device that adapts to the morphology of the face of all ages. 

Sources :

Stéphane Gayet, Hygiène : comment combattre la propagation du coronavirus ? 04/03/2020

INRS

Marianne.net : hygiene, comment combattre la propagation du coronavirus

Par Brigitte Veron : Microbiologie-medicale.fr Virologie, Generalités et Virus

Modélisation de la propagation d’un virus, Insa, Rapport_P6-3_2010_01