How does the TH1 and TH2 Immune system work? Do vaccines affect the immune system balance?

References:
1. Virus Mania - 3rd edition
2. Healthy instead of chronically ill - Dr Joachim Mutter (German):
https://www.amazon.de/Gesund-statt-chronisch-krank-ganzheitliche/dp/3898815269

3. CD8+ T cells:
https://www.immunology.org/public-information/bitesized-immunology/cells/cd8-t-cells

4. IgG Subclasses and Allotypes:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4202688/

5. Eosinophil:
https://en.wikipedia.org/wiki/Eosinophil

6. Cytotoxic T Cells: License
https://www.youtube.com/t/creative_commons

Source videos
https://www.youtube.com/attribution?v=IDvUBz_zQsc

7. Cochrane’s new donor:
https://www.cochrane.org/news/cochrane-announces-support-new-donor

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