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The primary position of the immune system is to forestall illness brought on by an infection. Infections will be brought…

Subscribe and to the BBC https://bit.ly/BBCYouTubeSub Watch the BBC first on iPlayer https://bbc.in/iPlayer-Home … source

Subscribe and to the BBC https://bit.ly/BBCYouTubeSub Watch the BBC first on iPlayer https://bbc.in/iPlayer-Home Why … source