Environmental factors may be important but not decisive in the spread of SARS-Cov-2. Some evidence is already there for all to see: an idea of ​​diffusion can be inferred from diffusion in the equatorial and boreal areas as early as January- March 2020. However, there are many factors (politics, genetic susceptibility, individual susceptibility) that can be confusing. As far as I am aware, there are no experimental studies that have fully clarified the doubt that you have posed.

Matteo Nioi Thanks for all these considerations.

Reza R.Kh

I do not believe that this pandemic can be stopped by environmental factors. COVID-19 began to spread rapidly across the planet. It is demonstrated that the environmental factor does not limit its expansion. At the level of infection that exists today, the only way to stop this pandemic is through a massive vaccination process. Creating a vaccine is a time consuming and money consuming process. There is currently a rampant race to obtain an efficient vaccine that can stop this coronavirus. But in the immediate future I do not think it is possible. I do not believe that within 12 months the vaccine or group of vaccines can be obtained effective and accessible for the majority. I'm not pessimistic I'm realistic.

Reza R.Kh

Reza Rezaie Khanghah

Reza Rezaie Khanghah

Reza Rezaie Khanghah

We now know that the overall pattern of the development of a coronavirus (Covid-19 disease) epidemic in each country is similar. However, the pace of development of the Covid-19 Koronavirus epidemic in individual countries is not the same. This is determined by many factors. In addition to the issue of mutating the virus and creating new, other strains, varieties of this Coronavirus from current scientific research, we know that there are at least several other important determinants responsible for the unidentical development of the epidemic in individual countries or continents. Environmental factors can be important, but not the most important. For example, SARS-CoV-2 Coronavirus outside of the human body can survive from several dozen minutes to about 72 hours depending on the temperature, type of surface and chemical composition of the material on which it is located, humidity, sunlight, etc., and therefore also according to specific conditions environmental. In addition, specific environmental conditions significantly different in individual climate zones may also be correlated with the level of collective, social resilience of a particular local community or society of a particular region, climate zone or continent. In the context of this issue, an important issue is the problem of constant mutation of this virus. Well, the SARS-CoV-2 Coronavirus, like many other types of viruses, quickly mutates. As you read my comment, new mutant strains of Coronavirus are emerging. However, most of the new, mutant strains of Coronavirus do not differ much or in practice do not differ much from the previous ones. But in the situation of a much longer time of virus functioning in many people, during infections of many more people, infections occurring in different environments and situations in which people operate, it is possible that different varieties, strains may occur on individual continents, in particular countries, regions Coronavirus, which can vary significantly and cause noticeable, significantly different effects, different responses of the infected organism, and may cause other symptoms of the same Covid-19 disease. Currently, there are already research results suggesting diversification of the development of the SARS-CoV-2 Coronavirus pandemic in individual climatically, environmentally, geographically diverse regions etc. On the other hand, because the SARS-CoV-2 Coronavirus undergoes permanent degradation only above 60 ct. C, so it is able to survive in many different climatic zones. In addition to temperature, significant factors influencing the SARS-CoV-2 Coronavirus survival time on the surfaces of various materials include the type of material, surface, humidity, etc. These factors, if they are significantly different in different regions, climatic zones, continents, could determine different directions of coronavirus mutation SARS-CoV-2 in individual regions, however, the restoration of tourism should once again increase the importance of the global nature of the issue of mutation of SARS-CoV-2 Coronavirus. Due to the fact that the SARS-CoV-2 Coronavirus constantly mutates, so from the autumn of this year and in subsequent years, this virus in new mutated variants may return in the same way as flu. However, these recurring waves of infection with mutated, new varieties of SARS-CoV-2 Coronavirus should not have such potentially negative effects as in most countries in the months March - April 2020, as well as anti-crisis activities and programs introduced in individual countries by the government as part of anti-crisis social policy - economic will no longer have to be used on such a scale of public money involvement as it is today. This is also an important issue, because perhaps we are now observing the beginning of the end of the SARS-CoV-2 Coronavirus pandemic. In recent weeks (May - June 2020) positive information flows from some countries, published in various media, suggesting that the SARS-CoV-2 Coronavirus pandemic is entering a phase of extinction. This positive information is the stabilizing or falling number of new infections, the growing number of people who have recovered from Covid-19 disease, and the falling number of deaths caused by severe complications caused by some infected people with Covid-19 disease. Perhaps, to a significant degree, societies have already acquired natural, collective, social immunity to Coronavirus (about 80 percent of those infected are undergoing Covid-19 disease asymptomatically).

Greetings,

Dariusz Prokopowicz

Dariusz Prokopowicz Thanks so much!

Sunlight and effect on COVID-19

The study below may indirectly shed light why COVID-19 is less vicious in sunny areas of the world with less mortality.

Airborne SARS-CoV-2 is Rapidly Inactivated by Simulated Sunlight

https://academic.oup.com/jid/advance-article/doi/10.1093/infdis/jiaa334/5856149

Muhammad Yousuf Thanks a lot! Probably, air pollution may also play a role:

Navel, Valentin, Frédéric Chiambaretta, and Frédéric Dutheil. "Coronavirus: good or bad news for ocular diseases?." (2020): e000495.

Temperature significantly changes COVID-19 transmission in (sub)tropical cities of Brazil https://doi.org/10.1016/j.scitotenv.2020.138862