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Insect bites or stings, like the one on this person’s hand, are a manifestation of inflammation. Suthep Wongkhad/EyeEm via Getty Images

What is inflammation? Two immunologists explain how the body responds to everything from stings to vaccination and why it sometimes goes wrong

Inflammation is a complicated and important part of how the immune system responds to threats to the body. But when the inflammatory response goes awry, it can lead to serious problems.

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