Kernig's sign

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Kernig's sign is a test used in physical examination to look for evidence of irritation of the meninges or meningitis.

Excerpt from the Wikipedia article “Kernig's sign”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: R. G. Wiener, Harlem Hospital, Public domain, via Wikimedia Commons.