Discussion
Which type of immune cells are responsible for eradicating intracellular pathogens?
Answer: A
Correct answer: natural killer cells
Natural killer cells deal with pathogens hiding inside cells. They do not recognise the pathogen itself; they check whether a cell is displaying its normal MHC class I molecules, and kill it if it is not - which is exactly the state a virus-infected or tumour cell tends to be in. Being part of innate immunity, they act without any prior exposure.
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