This is a long video for me, but stick with it - there‘s a light at the end of the tunnel!
What‘s the difference between DNA and mRNA https://wwwverywellhealthcom/rna-vs-dna-vaccine-5082285
How long will the Covid vaccine last: https://wwwyalemedicineorg/news/how-long-will-coronavirus-vaccine-last
Natural immunity vs vaccine https://wwwmedrxivorg/content/101101/2021082421262415v1
What are T Cells: https://wwwnews-medicalnet/health/What-are-T-Cellsaspx