Actually, there have been as many as 14 deaths Australia wide from Redback bites.
Redback spider - Wikipedia, the free encyclopedia
They can cause some pretty severe symptoms but only the elderly or infirm tend to be killed by the bite..
Symptoms
Bites from Redback spiders produce a syndrome known as latrodectism, with symptoms similar to bites from other Latrodectus spiders. The syndrome is generally characterised by extreme pain and severe swelling.[24] The bite may be painful from the start, but sometimes only feels like a pinprick or mild burning sensation. Within an hour victims generally develop more severe local pain with local swelling and sometimes piloerection (goosebumps). Pain, swelling and redness spread proximally from the site. Systemic envenoming is heralded by swollen or tender regional lymph nodes; associated features include malaise, nausea, vomiting, abdominal or chest pain, generalised sweating, headache, fever, hypertension and tremor.[17][18] Rare complications include seizure, coma, pulmonary edema, respiratory failure or localised skin infection.[23] Severe pain can persist for over 24 hours after being bitten.[25]
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