MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Jellyfish sting on a patient's shoulder. A jellyfish's tentacles contain stinging cells (nematocysts) that discharge venom when touched. The severity of a jellyfish sting depends on the species that inflicted it. Symptoms can range from a mild rash to death. Treatment involves removing any attached tentacles and then using vinegar to neutralise the stinging cells.
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