Every functional organism has a mechanism to stay functional. This is true of all living organisms including, viruses, fungi and bacteria.
Different living organism have different arrays of genes which control their metabolism, growth, homeostasis and immune system.
A full array of genes associated with SARS CoV-2 was dowloaded from GeneCards (25Sep2020). These genes were then runthrough our database of all genes associated with the mechanism which controls metabolism, growth, homeostasts, and immune response.
There were only three changes from the array from March with exclussion EIF4E and MBP and addition of EIF2AK2.
All of these genes are switched on by IR radiation and off by UV radiation. Hence the CoV-2 virus like others does not funtion with high levels of sunshine.