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10-15 years ago, you rarely ever heard about these nasties.
SymptomsMost stings occur during the summer wet season in December-January in North Queensland, with different seasonal patterns elsewhere.
Because the Jellyfish is very small, and the venom is only injected through the tips of the nematocysts (the cnidocysts) rather than the entire lengths, the sting may barely be noticed at first. It has been described as feeling
like little more than a mosquito bite. (Chironex- or box jellies on the other hand- people KNOW the instant they are stung).
The symptoms, however, gradually become apparent and then more and more intense in the following 5 to 120 minutes (30 minutes on average). Irukandji syndrome includes an array of systemic symptoms including severe headache, backache, muscle pains, chest and abdominal pain, nausea and vomiting, sweating, anxiety, hypertension, tachycardia and pulmonary edema.
One unusual symptom associated with Irukandji syndrome is a feeling of "impending doom". Patients have been reported as being so certain that they are going to die that they beg their doctors to kill them to get it over with.
Symptoms generally abate in 4 to 30 hours, but may take up to two weeks to resolve completely.<5>
TreatmentSimilarly to other box jellyfish, first aid consists of flushing the area with vinegar to neutralize the tentacle stinging apparatus. There is no antivenom; treatment is largely supportive, with analgesia being the mainstay of management.
Antihistamines may be of benefit for pain relief,<14> but most cases require intravenous opioid analgesia. Fentanyl or morphine are usually chosen. Pethidine (aka meperidine in U.S. (Demerol)) should be avoided, as large doses are often required for pain relief and in this situation significant adverse effects from the pethidine metabolite norpethidine may occur.
Geographic distributionReports of Irukandji syndrome have come from Australia, Hawaii, Florida, French West Indies, Bonaire, the Caribbean, Timor Leste and Papua New Guinea. It is presumed that cubozoan species other than Carukia barnesi are responsible for envenomations outside Australia.
More:
http://en.wikipedia.org/wiki/Irukandji_syndrome