Can the Covid19 be airborne? Via airborne particles? Pollution, pollens, fog

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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by not C » 05/04/20, 08:41

Thank you for this important video.

In France, it is the reverse discourse of these Japanese scientists which is widespread by the representatives of the State. They will have to explain to us one day for what purpose.
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 05/04/20, 10:04

Yes Aleluia !!

They wake up ?!?

It's stupid to do it 4 weeks late ... they are responsible for hundreds of thousands, even millions of infected for nothing ... Even if the official figures may not speak of as many infected !

Shall we talk about it in 3 weeks? : Evil: : Evil: : Evil:
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 11/04/20, 01:42

It's ugly ... for all those who have never worn masks in public places since March 1 ... I am one of them ... like 99.99% of people : Cheesy:

https://www.huffingtonpost.fr/entry/le- ... 6349a323da

Coronavirus could fly up to 4 meters around a patient

However, the study does not show whether the virus ejected into the air travels up to 4 meters in sufficient quantity to make Covid-19 sick.
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 15/04/20, 22:52

https://www.laprovence.com/actu/en-dire ... nts-cet-et
Coronavirus - Germany: wearing masks in transport and stores, no large gatherings this summer


and in luxembourg they are compulsory ...
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Evaluation » 18/04/20, 00:27

pasc wrote:Thank you for this important video.

In France, it is the reverse discourse of these Japanese scientists which is widespread by the representatives of the State. They will have to explain to us one day for what purpose.

You surprise me !
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 11/07/20, 11:06

FranceTv takes stock of the virus transmission: https://www.francetvinfo.fr/sante/malad ... 39191.html

Note that the WHO response is a bit late ... and I weigh my words!

Coronavirus: what we know and what we still don't know about Covid-19 transmission

The possible transmission of Covid-19 by fine particles suspended in the air, publicly mentioned by scientists on Monday, is not the only aspect on which gray areas persist.
"It's time to talk about the airborne transmission of Covid-19". In their open letter to the World Health Organization (WHO), 239 scientists around the world recalled on Monday July 6 that the way the new coronavirus is transmitted is still being debated by scientists, and that many areas of the world shadow persist, more than six months after its appearance in China.

In an interview with Le Monde (paid article), Thursday, the President of the Scientific Council, Jean-François Delfraissy, recalls how knowledge of this virus is constantly evolving: "There are things we didn't know in March that we know better now and that we will know even better in November. "Franceinfo summarizes the main knowledge and questions about SARS-CoV2 contamination.

What we know

• You can be contaminated by droplets. This is the most well-known mode of transmission, one that is not the subject of any doubt or debate: the large droplets of saliva projected by carriers of the virus, directly on someone, but also on their own hands or surrounding surfaces that others then touch. The fact that the droplets come into contact with the skin is not in itself a problem. However, "the virus will be on the hands and, when they will touch the mouth or the eyes, it will infect", reminds franceinfo Etienne Decroly, researcher at the CNRS and member of the French Society of Virology. The large droplets are the environment in which the virus "is most stable" and survives the best, he explains, in part because they are "less susceptible to dehydration". An idea which is not new to anyone after months of pandemic, but which should not be forgotten, reminded franceinfo Xavier Lescure, doctor at Bichat hospital in Paris: "Transmission through the hands is a clear vector, and so we must not focus everything on the mask "by forgetting the other barrier gestures.

• Close and prolonged contact with a sick person is the most dangerous situation. This idea does not raise any debate either. Close contact with a sick person places the largest droplets within reach, those in which the virus is the most protected but whose weight only allows them to travel a limited distance. Public Health France considers as "risk contacts" the face-to-face at less than one meter, or during several episodes of coughing or sneezing, as well as the fact of having shared an enclosed space for at least 15 minutes. This concept serves in particular as a basis for the brigades responsible for warning the contacts of people who test positive, in France as elsewhere.

• It is possible to be contagious without having symptoms. This is one of the peculiarities of this coronavirus: unlike others, it is possible to transmit it if you are asymptomatic (carrier without developing any symptoms) or presymptomatic (carrier before symptoms appear), which complicates the fight against its spread. Again, there is now consensus on the issue, but the role of the asymptomatic has been nuanced.
A point of view shared by the epidemiologist Pascal Crépey, who quotes to Franceinfo a study of Oxford scientists published by the journal Science (in English) estimating that at the beginning of the epidemic in China, asymptomatic were not responsible than 10% of contamination. In a synthesis of several studies, Public Health France judges this part difficult to evaluate, but concludes that, in a context of active surveillance of the virus, t • It is possible to be contagious without having symptoms. This is one of the peculiarities of this coronavirus: unlike others, it is possible to transmit it if you are asymptomatic (carrier without developing any symptoms) or presymptomatic (carrier before symptoms appear), which complicates the fight against its spread. Again, there is now consensus on the issue, but the role of the asymptomatic has been nuanced.

[They] have a much lower virus level and therefore play a less important role than previously thought
Jean-François Delfraissy, President of the Scientific Council
at Liberation

A point of view shared by the epidemiologist Pascal Crépey, who quotes to Franceinfo a study of Oxford scientists published by the journal Science (in English) estimating that at the beginning of the epidemic in China, asymptomatic were not responsible than 10% of contamination. In a synthesis of several studies, Public Health France considers this part difficult to assess, but concludes that, in a context of active surveillance of the virus, half of the contaminations are the work of patients who have not yet declared symptoms. This observation shows the importance of respecting the instructions even by those who do not think they are contaminated. This observation shows the importance of respecting the instructions even by those who do not think they are contaminated.

The virus is mostly caught indoors. "The confined spaces in which the crowd crowds" appear today as the "heart (...) of the contamination", considers Jean-François Delfraissy in Liberation (paid article). If it does not cover all the people affected, the list of clusters (places where at least three cases are identified in seven days) published each week by Public Health France testifies to this: most of them are in establishments. health (24,7%) or accommodation such as nursing homes (14,1%), in companies (16,8%) and during family gatherings (12,2%). "China has shown that the main place of contamination is the family home" (without necessarily reaching the size which makes it a cluster), explains infectiologist Anne-Claude Crémieux to franceinfo. Proximity and duration of exposure to a potential patient are in question here.

Conversely, transport is little affected, with only four updated clusters in France. Moreover, while the opening of parks and beaches has long been the subject of debate, epidemiologist Pascal Crépey notes that "we have not, to [his] knowledge, identified no clusters of contamination outdoors. This can happen, but confined spaces are a more important risk factor. "In Liberation, Jean-François Delfraissy notes that" we have just passed the period of fifteen days after the music festival ", where images of compact crowds in the streets had worried, without any rebound of the epidemic was observed.

• Wearing a mask and washing your hands are helpful. Whatever the uncertainties about the transmission of the virus, one thing is certain and is now the consensus: you are better protected against the virus by respecting barrier gestures (washing your hands and wearing a mask).

What we still don't know

• If the virus may be present in fine droplets. This is the debate of the moment. In an open letter released on Monday, 239 scientists asked WHO to recognize that the virus can be transmitted via fine droplets in the air. The organization has not yet considered this scenario, any more than the French authorities: "No transmission by air", can we still read Thursday on the government site.

These scientists do not claim that a gust of wind could represent a contamination factor. However, the human being, when he coughs or speaks, emits "large droplets, but also finer particles" which can also carry the virus, explains to franceinfo Francis Allard, one of the signatories of the open letter. The smaller they are, the more they float in the air, potentially over "tens of meters", the scientists specify in their letter. Outdoors, they disperse quickly, but "in closed places, if ventilation is poor, they can stay for a long time," says Francis Allard, engineer specializing in indoor air quality at the University of La Rochelle. A US laboratory study published in April in The New England Journal of Medicine estimated the lifespan of the novel coronavirus as particles in the air at three hours. It was also found in the air of hospital rooms in China, as reported by the New York Times, in April.

(...)

Faced with such an avalanche of factors, all plausible and which can complement each other, many uncertainties remain. "Faced with a new virus, we should not live on certainties", adds Anne-Claude Crémieux. If observation shows that closed and poorly ventilated environments are more dangerous than the outside, "the truth is that we are unable to say what is really happening, and to measure the risk exactly", indicates the infectious disease specialist.

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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 22/07/20, 00:45

Roooh but what a surprise !!

http://www.leparisien.fr/societe/corona ... 356689.php

Coronavirus: first evidence of its infectious risk in exhaled air

The coronavirus in the air exhaled by humans is arguably infectious, according to American researchers.

(...)

A team from the University of Nebraska has for the first time succeeded in replicating SARS-CoV-2 particles collected from the air in rooms of patients with Covid-19, boosting the hypothesis that the virus is transmissible not only by the postilions and large droplets emitted by coughing and sneezing, but also by the microscopic droplets that we release when we breathe and speak, and which are so light that they stay in suspension for a long time, in the absence ventilation.

(...)


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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 05/08/20, 19:00

No kidding ? Here are the Belgian government's instructions for the day:

Regarding the use of fans and air conditioners, the Center explains: "When it is very hot, we want to use the fans. We recommend that you only use your fans in the private setting of the house and in company, obviously, people not contaminated by COVID because ventilation can project droplets farther", details Frédérique Jacobs."The air conditioning system is not a source of viral contamination and could, on the contrary, reduce the risk of contamination because the cold air is often renewed there but it is then necessary to ensure that the system blows in new fresh air and does not not reuse the air in the room. Finally, these air conditioners must be properly maintained."


I have been saying for months that we have to cut air conditioning and ventilation in public places !!!

Regarding the air conditioning they are, once again, completely collected since the Sars-Cov2 is THERMOLABILE and the air conditioning does not take the air from the outside but the calories!

I want to type there so much I read nonsense!

You ass * rds !!

Source: https://www.rtbf.be/info/dossier/epidem ... d=10555512
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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by Christophe » 22/08/20, 02:06

It's good they're not late ... : Shock: : Shock: : Shock:

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Re: Can Covid19 be (semi) air via particles (pollution, pollens, fog ...)?




by izentrop » 22/08/20, 02:39

Christophe wrote:It's good they're not late ... : Shock: : Shock: : Shock:
At the same time, it is not pollution, pollen or fog, but micro droplets that can move several meters and extremely unlikely outdoors
Contamination in an outdoor environment is a priori much rarer than indoors, because the human density is generally lower there. Viruses are also confronted with natural elements: the wind or the breeze disperse them, and ultraviolet rays quite effectively destroy viral particles.

Contacted by Le Monde, the regional health agency (ARS) of Ile-de-France claims to have spotted no cluster involving an exclusively external environment. Even if an event took place partly in the open air, the ARS cannot precisely distinguish the mode of contamination: droplets suspended in the air, direct and prolonged contact between people, contamination in an enclosed space, etc. . At the national level, most of the outbreaks detected formed in closed places.

Many outdoor public places can offer insufficient ventilation conditions, experience a high human density and slow or even stagnant traffic. This may be the case for narrow and densely frequented shopping streets in high season, outdoor shows or even gatherings like the one that brought together many supporters of Paris-Saint-Germain on Tuesday August 18 on the Champs-Elysées. In this kind of setting, where many people are talking or shouting, contamination is possible, even outdoors.
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