Covid-19 first emerged in China around mid-December, the virus has spread quickly, with the number of cases now rising most sharply in Europe, the US and another part of the worlds. Viruses do not replicate outside the living cell but the infectious virus may persist on contaminated environmental surfaces and the duration of persistence of viable virus is affected markedly by temperature and humidity.
The various studies have been done on the effect of pH and temperature on the infectivity of human coronavirus 229 E , Severe acute respiratory syndrome (SARS) virus that spread in 5 continents in 2003 [chan], respiratory tract infections coronaviruses [7] and many other. The virus viability was rapidly lost at higher temperatures and higher relative humidity (e.g., 38°C, and relative humidity of >95%). All these past experiences showed “marked winter seasonality” and mainly between December and April.
The Covid-19 – which has been officially named SARS-CoV-2 – is too new and means there is little information about how it was affected by the seasons. But there are some clues from other coronaviruses that infect humans as to whether Covid-19 might eventually become seasonal and leading to speculation that the disease might begin to tail off with the arrival of summer.
Actually ,I dont think there is relation ship between temperature effected on Covid19 , because the temperature in Iraq over than 50 C For eight consecutive days , and normally in Iraq between 45 -50 but the Infection is constantly increasing.
We know that the flu, for example, is a seasonal phenomenon, the arrival of spring leading to a significant drop in the number of cases. In addition, we see that the COVID-19 seems to spread less quickly in the countries of the southern hemisphere, like in Africa.
This situation is linked to several phenomena linked both to the nature of the virus and to our behavior. First, the flu virus seems to survive better in cold, dry weather, with less ultraviolet light. Second, shorter winter days lead to reduced levels of vitamin D and melatonin, which can affect the performance of our immune system. Finally, we spend more time indoors with other people, which increases the chances of the virus spreading. Dry air in winter (outside or inside) alters the efficiency of the nasal mucus which filters foreign bodies such as viruses or bacteria.
But, can we compare the flu and the coronavirus Sars-Cov-2? The mode of transmission (by microdroplets when sneezing) is in any case identical. However, when it is hot, these droplets tend to evaporate more quickly, which limits transmission. A study by the Chinese University of Beihang published on March 3, 2020, on the scientific site SSRN modeled the contacts between the patients of the big Chinese cities crossed with meteorological data. She concluded that "high temperature and high relative humidity significantly reduce the transmission of COVID-19". Researchers estimate that the reproduction rate (indicating the contagiousness of the virus) should drop by 48% between March and July. But beware: heat does not kill the virus and does not prevent it from spreading: it simply slows its progression.
In short, it is better not to rely on the mere arrival of sunny days to change the trend. Hence the containment measures announced by governments which, we hope, will last as short a time as possible.
Regards
Please take a look at this useful link.
https://arxiv.org/ftp/arxiv/papers/2003/2003.05003.pdf
No specific study has shown that the Covid-19 virus is influenced by temperature (far as I know). But enveloped viruses like the Covid-19 virus. The envelope is lipid in nature. lipids are known to be thermolabile (influenced by temperature). and thus the envelope is destroyed and the virus loses its effectiveness. The structural virus completes with an envelope (Virion) outside the cell. We can say that the temperature factor can influence the rate of contamination and infection as desired.
= the Covid-19 virus is a fragile virus outside.
The higher the temperature, the lower the propagation rate.
https://www.newscientist.com/article/2239380-will-the-spread-of-covid-19-be-affected-by-changing-seasons/
from climatology point of view, It will take a long time to find out. But from meteorology point of view temperature and humidity may affect the covid19.
The first research in China indicates that Covid-19 incidence can't be explained from meteorological variables. Also for flu-like epidemics, meterological variables are insufficient to explain flu-like seasonality. Worked on identifying another predictor. Now doing follow up studies: Article Pollen likely seasonal factor in inhibiting flu-like epidemi...
At present no observation has indicated the link between infection rate and weather change. However, there are reports showing that there is a strong dependence. One has to really look into the type of COVID 19 existed during the outbreak to understand the biological mechanism in detail. So unless and until we can consider this issue only empirically.
Please have a look at the following link:
Preprint High Temperature and High Humidity Reduce the Transmission of COVID-19
Indeed this shows the influence of weather on virus infection. But this is a statistical analysis which did not taken into account of varying incubation period. Further this cannot applicable on a global scale till then one has wait for reports described with good science.
The temperature and relative humidity affect COVID 19 due to heat and dry air. Reduces virus retention in this environment. The main reason is that it is transmitted by the injured due to the hot summer. Most people stay indoors, which reduces infection rates.
Scientists have reported that high temperature and high relative humidity might reduce the transmission of COVID 19. Thus, it may be assumed that the severity of the outbreak will be negatively correlated with temperature and humidity with the possibility of longer virus survival in cold weather than warm weather. However, differences in opinions suggest that warm weather would probably not slow down the spread of COVID 19.
Temporal relationships between the two issues needs further evaluation.
Actually ,I dont think there is relation ship between temperature effected on Covid19 , because the temperature in Iraq over than 50 C For eight consecutive days , and normally in Iraq between 45 -50 but the Infection is constantly increasing.
I have found that if you block your nose and breathe through your mouth you can raise the temperature in your sinuses and nasal passages to core temperature in 5-10 minutes. The cooling effect of fresh air is stopped and the relative humidity is greater than 95 %. If heated to greater than 39 degrees C, this should stop the incubation of the viruses in these primary growth areas.
I have been dispatching colds and flu for several years now using a heating pad applied to nose and sinuses. Not blocking my nose. This is a recent improvement since SARS-CoV-2. The takes about 1.5 hours, 10-20 min. at each location.
Also, I found hand warmer pouches used when skiing are an excellent heat source. They are designed for human use and allowed temperatures.
You could name this the enhancement and optimization of the fever portion of the immune response.
Because skiing is my passion I posted this on my ski blog to keep skiers safe.
AlanR
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