Queensland experienced a significant surge in Ross River virus cases during the 2023-2024 summer season (November to April). A total of 2,065 cases were reported statewide, significantly higher than the five-year average and a substantial increase from the 695 cases reported in 2023. This surge coincided with a record number of mosquitoes testing positive for Ross River virus.
During the 2023-2024 summer season, over 1,225 mosquito traps were tested, with a staggering 116 showing positive results for Ross River virus. This is the highest number of positive tests in a single season since surveillance began in 2016.
The majority of cases were concentrated in southeast Queensland, with the Sunshine Coast, Metro North, Metro South, Gold Coast, and Wide Bay regions experiencing the largest increases.
To combat this outbreak, Queensland Health, in collaboration with local governments, employs a unique surveillance program where mosquito saliva is tested for viruses, including Ross River virus. This proactive approach allows for rapid risk assessment and the ability to adapt to emerging threats like Japanese encephalitis virus.
Prevention is crucial as there is no vaccine for Ross River virus.
Key preventive measures include:
- Applying insect repellent: Use repellents containing DEET, picaridin, or oil of lemon eucalyptus to exposed skin and reapply as directed.
- Wearing protective clothing: Cover arms, legs, and feet with loose, light-coloured clothing.
- Utilising insecticide sprays and vapour dispensing units.
- Employing mosquito nets when camping.
- Avoiding outdoor activities during peak mosquito hours (dusk and dawn).
While most people recover from Ross River virus, some may experience prolonged joint pain and fatigue.
Disclaimer: This information is for general knowledge and guidance only.
Sources: National Notifiable Disease Surveillance System, Queensland Health