Jellyfish Sting Treatment
1. Get the Person Out of the Water
2. Stop Stinging
For a jellyfish sting in non-tropical waters:
Wash the area with seawater to deactivate stinging cells.
For a sting in tropical waters -- especially from box jellyfish:
Rinse immediately with vinegar. Do not use fresh or tap water, which can reactivate stinging cells.
Continue until you can get medical help.