What is the recommended first aid step for jellyfish stings when vinegar is available?

• A. Rinse the area with freshwater
• B. Flush area with vinegar for at least 30 seconds
• C. Apply cold pack
• D. Ignore and wait

Answer: (B)

Vinegar is used because it inactivates remaining jellyfish nematocysts, stopping further venom release. When available, apply vinegar to the affected area for at least 30 seconds to prevent additional stings. After this, rinse with seawater to remove tentacles and avoid rubbing, and skip freshwater since it can trigger more discharge. This step helps reduce the amount of venom delivered and limits tissue damage, forming the essential first aid action for jellyfish stings when vinegar is on hand.