The first case of encephalitis caused by a mosquito-borne flavivirus has occurred in Western Australia in 2024. While testing has not yet provided a definitive confirmation, it is likely to be Murray Valley encephalitis (MVE).
The adult was exposed to infected mosquitoes in the Pilbara region and is currently receiving medical care.
Managing Scientist, Dr Andrew Jardine, urged local community members and travellers to be on alert for mosquito bites across northern WA.
"MVE can be deadly, and we are currently seeing ongoing activity across the Pilbara and Kimberley regions." Dr Jardine said.
"As a community, keep one another informed. Chat with anyone living at your home, or your next-door neighbours, to ensure they know what can be done to protect against mozzies."
"Avoiding bites will also protect against other infections carried by mosquitoes."
Community members can protect against mosquito bites by following these steps:
- Avoid being outdoors at dawn and early evening when mosquitoes are most active.
- Wear long, loose fitting, light-coloured clothing.
- Apply an effective personal mosquito repellent containing diethyltoluamide (DEET), picaridin or Oil of Lemon Eucalyptus (also known as PMD) evenly to all areas of exposed skin and always follow the label instructions.
- Dress babies and children in suitable clothing, including socks/shoes, and use bed/pram netting.
- Ensure insect screens are installed and in good condition on houses and caravans.
- Use mosquito nets and mosquito-proof tents if sleeping outside.
- Keeping grass and other vegetation short will reduce shelter for mosquitoes around your home.
Initial symptoms of MVE include fever, drowsiness, headache, stiff neck, nausea, and dizziness. In young children, fever might be the only early sign of infection.
Anyone with these symptoms, particularly following a mosquito bite, should seek medical advice.
