Tag: <span>green snot</span>

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Why is snot green? Immunologist answers 8-year-old’s burning question (and reveals the grim colour is actually good news for your immune system!)

When someone has a cold or infection immune cells kill off the virus or bacteria When the immune cells, which contain a green chemical, die they end up in snot The green colour is a sign your body is successfully fighting an infection  It is thought to be a sign that a sniffle is something...