How likely is the new coronavirus to be transmitted by airway?

Every day we learn new things about the new type of coronavirus SARS-CoV-2, which the world is experiencing. The issue of transmitting the virus by air has also been discussed for some time.
Let's first define the aerosol transmission (airborne contamination). of course, first of all, what is aerosol? You can think of the aerosol as a physical term in which a liquid or solid substance is contained in a cloud of gases in tiny particles that cannot be seen. due to various physical and chemical forces, these particles can stay in the air with the gas cloud umbrella I just mentioned a while ago. for example fog is a good example. water droplets do not fall to the ground and are kept in the air. how long these water particles stay in the air changes according to temperature and humidity. Next, it is useful to explain what we mean by aerosol transmission. Let me explain what happened first through the example. The infected person you were sitting next to was full of sneezing / coughing and could not close his mouth because he was a real animal. you have also been infected with drops from the man's sneeze / cough because of the close range. Actually here, the droplets have reached you by air, but these droplets that do not comply with our aerosol definition have been transmitted to you just because you are less than 1 meter away and are caught immediately after sneezing / coughing. If the virus in these droplets that came out with a sneeze / cough momentum (think like a ball firing, of course there is not such a big push), it would have fallen to the ground very soon due to gravity.
If there is no problem here, now let's come to what is airborne transmission. Let's explain again through the example. The infected person (x) got on the elevator at 21.00 and got off after 1 minute. the healthy person (y) got on at 22:00 and landed again 1-2 minutes later. where x to y contamination is negligibly low. x is low, even if she sneezes with her mouth open coughing from 21:00 to 21:01. Most people who read this part will have the question 'But you know, the virus was left in the air for 3 hours'. Let us come to the answer to this question in a subparagraph, since we also drop wolves to those who no longer form.

the information in question is based on a recent research by the national institute of allergy and infectious diseases (niaid). according to research sars-cov-2; It can stay alive for 3 hours in the air, 4 hours in copper, 24 hours in cardboard, 2-3 days in plastic and metal, even if it does not find a host. pretty scary at first glance. but when we go a little deeper, we see spots with suspicion. I share below how both the research is done and the evaluation made by the scientists about the research.

In the research, the formation of virus-containing aerosols was achieved with a mechanical sprayer, not with the patient's human breath or cough. This is the basic point that prepares the ground for criticism of the research. Because the virus carrier has passed the breathing of a normal person, even coughing and sneezing will probably release fewer viruses into the air than this mechanical sprayer produces. Moreover, since real life conditions will be different from the laboratory conditions prepared for the virus to stay in the air for this research, it is not ideal to consider 3 hours (actually 2.7) hanging as a clear truth. The conditions provided in this research are claimed to revive the intubation process that can be applied to the patient in the hospital rather than the natural movements of the infected person. Therefore, it is argued that for aerosol transmission, physicians who will be in close contact with infected patients in the hospital environment rather than normal citizens are at greater risk. Therefore, it is more plausible for doctors to wear quality masks in the ffp2 ffp3 class and to wear protective clothing. No positive / negative response has been received from the researchers to these feedbacks. The research is not the question of 'is this virus transmitted by airway under normal conditions'? It gives the image that was made to look for an answer to the question 'how many hours can I keep the virus in the ideal conditions?' On the other hand, the fact that the virus can remain on the metal and plastic floor in days to be expressed increases the importance of hand washing especially after leaving public transportation vehicles.

Another research was done in Wuhan and spread on March 10. this research is based on real life data rather than laboratory conditions. namely; 35 different air samples are collected from two hospitals based on the locations of covid-19 patients. As a result of the research, they did not detect the virus as an aerosol in places such as intensive care, corridors, patient rooms where covid-19 patients are present. The most common location of the virus in the air was toilets. Because the virus also affects the digestive system and can be observed in feces. As a result of the research, it is mentioned that the duration of the virus in the dirty toilets may be high.
As a result, we cannot say that airway contamination is not possible, but it is not possible to be paranoid in our daily life, and it is a more probable judgment that is thought by scientists. While those working in hospital conditions should open their eyes a little more to airborne contamination, we, as ordinary people, who and everybody shout, can provide a high level of assurance with measures such as hand washing, not taking the face to face, and not being in crowded environments.

note: these data contain the current date of the entry (16 March). New research on the subject to be made later can enable us to see more clearly.

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