These findings are shared for research purposes and indications for decision makers to help them broaden perspectives and expand understanding until they materialize in a reviewed paper.

Vitamin D, SUN, UVs

The epidemic took on a very different course between the northern and southern hemispheres. It picked up in late Fall/Aut

mn until winter in Wuhan(Northern hemisphere) and Brazil (South hemisphere). It then picked up in Europe and United States late winter  to subside as spring arrived.

We have found that for a variety of European and Southern hemisphere cities, there is strong association between daily UV levels (as published by  Tropospheric Emission Monitoring Internet Service ) and deaths as well as new cases. The association is particularly strong when the lethality and   new cases are lagged by 10-15 days (where the correlation coefficients range between |0.2| and |0.6|) as shown in the charts below.


Amounts of sun needed may vary upon individual skin nature and pigmentation.


For sunshine, the 4-month average of daily sunshine is correlated with death per capita, cases per capita, death count and case count at 0.1 significance level). There was no correlation for temperature.


Figure 2-  Cross-Correlation of UV index and Ozone for a selection of cities

Figure 3-  Correlation matrix of weather-related variables


Interestingly enough, at the time of writing this paper the epidemic is picking up in middle east, India and Pakistan late spring in spite of very high UV levels. This apparent contradiction may be explained by population increasing use of air conditionning, avoiding sun and spending more time in locked places thus creating better propagation conditions and further explaining the need for sun and fresh air to reduce spread or even reaching a point of disappearance.


The south to North gradient of epidemic curve drop in Europe as spring arrived combined with lower peaks in countries where parks were open and people accessing sun, further indicates a beneficial effect of sun or uvs or light or vitamin D.


This is further confirmed by the different studies made on vitamin D and Covid.

F Mitchell

V Backman

P Ilie, S Stefanescu, L Smith

M Ebadi, A J Montano-Loza

M Alipio


It has often been suggested that vitamin D may play a protective role in many respiratory and inflammatory diseases. Such suggestion may also be true for SARSCOV-2. 


These observations significantly indicates a possible beneficial effect of sun exposure on hosts beyond the direct effect UVs may have outdoor on the virus.



Figure 2 - Cross-Correlation of UV index and Ozone for cities





Figure 3 – Correlation matrix of weather-related variables

(What cities or countries?)




Copyright © MyWebsite. All rights reserved.