SafetyModerate risk
Are Mosquitoes Dangerous in Australia?
Quick answer
Most mosquito bites in Australia are just itchy, but some mosquitoes spread viruses. Ross River virus and Barmah Forest virus are the most commonly reported, causing fever, rash and joint pain. Murray Valley encephalitis and Japanese encephalitis are rare but serious, and dengue can occur in parts of north Queensland. Avoiding bites is the best protection.
Why this happens
Mosquitoes pick up viruses when they feed on infected animals — such as kangaroos, wallabies, birds or pigs — or people, then pass them on in later bites.
Risk rises in warm, wet seasons and after flooding, when mosquito numbers and virus activity increase. State health departments issue alerts when virus activity is detected.
Mosquitoes also spread dog heartworm, which is preventable with veterinary treatment.
What you may be seeing
- Fever, rash, tiredness or joint pain in the weeks after mosquito exposure.
- Health department alerts about mosquito-borne virus activity in your area.
What you can do
- Avoid bites: repellent, long clothing and screens, especially at dawn and dusk.
- Remove standing water around your home.
- Follow state health alerts, particularly after floods.
- Ask your doctor about Japanese encephalitis vaccination if you live or work in an at-risk area or with pigs.
- See a doctor about fever, severe headache, confusion or joint pain after mosquito exposure.
Seek urgent medical care (call 000) for severe headache, confusion, drowsiness, seizures or neck stiffness after mosquito exposure. PestMan does not provide medical advice.
When professional help may be needed
Medical advice is the priority for symptoms. For the home, reducing breeding water is more effective than spraying.
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Local information
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Sources & further reading
- healthdirect — bites, stings and infection information — healthdirect Australia
- Queensland Health — mosquito-borne disease and environmental health — Queensland Health
- NSW Health — environmental health and pest-borne disease — NSW Health
- Victorian Department of Health — environmental health — Victorian Department of Health
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