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Infection and immunity
Infection and immunity

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Session 4: Immune defences against infectious diseases


In this part of the course you'll look at the body’s natural defences against pathogens – the infectious agents that cause disease. We describe how physical and chemical barriers keep pathogens from entering the body and how the immune system uses a range of specially adapted cells and molecules to attack pathogens that get past these barriers. One of these cell types is known as a B cell and it plays a vital role in producing antibodies to fight infection.

Watch the following video to learn more about this process and the role of B cells in producing an immune response to vaccination.

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