Health Warning on Mosquitoes Print



Residents and visitors to the Shire of East Pilbara (SoEP) are being warned to protect themselves against mosquito-borne diseases such as Ross River virus, Barmah Forest virus, Kunjin virus and Murray Valley encephalitis.

Ross River virus was detected in mosquitoes in and around Newman and Marble Bar giving an early indication of increased risk of human disease for the upcoming wet season.

The best protection from these diseases is to avoid mosquito bites - protective measures include regularly using mosquito repellent containing picaridin or DEET, wearing loose fitting clothing when outside and ensuring accommodation is mosquito proof.

A range of information relating to protecting against mosquito bites is available on the Department of Health (WA)’s website.



Not all mosquitoes carry diseases – most are just a nuisance. Infected mosquitoes can carry a range of diseases including MVE, KUN, Ross River and Barmah Forest viruses. These diseases can cause serious illness and occur regularly in regional North Western Australia. Murray Valley encephalitis is rare but in a small percentage of infected persons, can cause serious illness including meningitis or encephalitis.

The summer holiday season is a time of increased outdoor activity, so taking measures to avoid mosquito bites is a critical step to protect against such diseases.



Anyone is potentially at risk of being bitten by mosquitoes and while most bites will only cause minor swelling and irritation, an infected mosquito can transmit potentially serious diseases. All parts of the SoEP where there are mosquitoes may carry a risk for mosquito borne virus infection.



Ross River virus and Barmah Forest virus disease are similar. Both can cause joint swelling and pain, fatigue and muscle aches which can persist for many months. A rash and fever may also develop. It takes three to nine days for symptoms of Ross River virus disease to occur after exposure, and occasionally up to 21 days. Barmah Forest virus disease symptoms occur between seven to ten days after a bite from an infected mosquito. While everyone recovers from the initial onset, symptoms may recur in some individuals for over a year or more.

Murray Valley encephalitis symptoms commence between seven to 28 days after exposure and include fever, headache, nausea and vomiting. This can lead to meningitis or encephalitis, which can lead to drowsiness, confusion, fitting, weariness or unsteadiness. In severe cases, delirium and coma can follow, resulting in brain damage or death.

The Kunjin virus can give a range of symptoms from very mild headache and muscle aches and a feeling of having influenza, but in a few cases it can produce encephalitis which requires hospitalization and may present with very severe headaches and neck stiffness and confusion.



There are simple steps to protect against mosquito-borne diseases:
  • Wear long, loose fitting clothes if mosquitoes are around.
  • Use effective mosquito repellents containing DEET or picaridin on all exposed skin.
  • Try to limit outdoor activity if lots of mosquitoes are about. Dusk and dawn is when most mosquitoes are more active but some will also bite during the day.
  • Use ‘knockdown’ sprays and plug-in vaporising devices indoors.
  • Sleep under mosquito nets treated with insecticides if you don’t have flywire screens on windows.
  • Mosquito coils can be effective in small outdoor protected areas.


For more information about mosquito-borne disease prevention, please contact the Shire’s Environmental Health Department on 9175 8000, email or visit: