Sources

Sources include:

     https://www.webmd.com/search/search_results/default.aspx?query=how%20does%20the%20immune%20system%20work

     

     https://www.thailandmedical.news/news/boosting-your-immune-system-in-times-of-viral-respiratory-outbreaks

     

     http://whoami.sciencemuseum.org.uk/whoami/findoutmore/yourbody/whatdoesyourimmunesystemdo 

     

     https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5091071/

     

     https://www.ncbi.nlm.nih.gov/books/NBK279364/

     

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