Why were official guidelines historically hesitant to recommend vinegar for Physalia physalis stings?
Answer
Because the man-of-war is a siphonophore, not a true jellyfish
The historical hesitation surrounding vinegar stemmed from the biological classification of the Portuguese man-of-war as a siphonophore, which is a complex colony of specialized organisms, rather than a true, single-bodied jellyfish. For many years, official recommendations treated *Physalia physalis* as an exception to standard jellyfish first aid, leading to specific discouragement of vinegar use based on the assumption that its biological difference required a unique, non-vinegar treatment pathway, despite the persistent pockets of contradictory advice.

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