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Let's look at influenza for instance. Again it spikes in the winter time when the sunlight is the least available.
This effect is so profound that observant individuals in healing arts profession over 150 years ago without sensitive scientific instruments could notice a difference when patients were taken outside.
https://twitter.com/healthyfellow/status/1903895404565110892Thanks to @ch__nob for alerting me to this post.

Infrared light reduces inflammation of TLR-4 (the same mechanism involved in COVID-19 inflammation:

Harvard did a study to see if this was in fact the case. They looked at the flu in 2009 and since it hit early during the summer (first pic), they were able to decouple temperature, humidity, and sunlight to see what was really going on (second picture). 
For more information:
And if you’re wondering why sunlight could affect something where the “sun don’t shine” then you need to revisit Scott Zimmerman‘s paper:
Why maybe increased sunlight is associated with LESS cancer deaths (in addition of LESS ALL-CAUSE MORTALITY).
This means that infrared light can "touch" just about every cell in your body. When this happens, spike protein induced inflammatory cytokines are reduced and anti-inflammatory cytokines are induced. Proof:
Reference: .pubmed.ncbi.nlm.nih.gov/3132509/#:~:te…