From ME Research UK.

Despite their dramatic name, natural killer (NK) cells are actually a very important part of our immune system and help protect us from viruses by killing cells that have been infected. They can also target tumour cells.

There is evidence to suggest that the cytotoxicity of NK cells (that is, their ability to destroy other cells) is compromised in some people with ME/CFS, which would have an impact on how well these individuals can fight off infections.

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