This is a paper on the 1918 influenza pandemic and UVB light which has some interesting implications for COVID, SARS2 ๐ฆ and COVID ๐.
The H1N1 virus allowed for bacterial colonization and pneumonia. (*bacteria + ๐ท๐งต) >
Fauci et al. conclude that most of the deaths in the Spanish Flu were from the secondary bacterial pneumonia. > pubmed.ncbi.nlm.nih.gov/18680641/
This is known as the "Sequential Infection Hypothesis" a better paper, and more detailed and elaborate explanation by Brundage and Shanks: > wwwnc.cdc.gov/eid/article/14โฆ