Covid( SARS-CoV-2) Effect on epithelial tissues

I need the introduction to be written for this term paper. The introduction should include what pathogen causes covid, explain a little about epithelial tissues and how covid-19 effects them and why this literature review is important.

should include a brief explanation of what epithelial cells/tissues are, what pathogens cause covid, and the immune response to covid — all briefly.
and include a little bit of data e.g. number of people affected by this and why this research is important

Im adding links to articles that you can use.

https://pubs.acs.org/doi/full/10.1021/acschemneuro.0c00370

https://www.frontiersin.org/articles/10.3389/fphar.2021.664349/full

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