Life in Australia Guide

In Australia, mosquito activity rises from spring through summer (roughly September to February), increasing the risk of mosquito-borne disease. The most common is Ross River virus, and since 2022 Japanese encephalitis (JE) has been newly identified in the inland south-east. Dengue is mostly acquired overseas and brought back, and local transmission within Australia is limited to specific regions. Because many of these diseases have no vaccine or specific cure, not getting bitten is the surest form of prevention. This guide is general public health information for people living inland or in the north, those who spend a lot of time outdoors, and anyone preparing to travel to a high-risk area. For seasonal health risks such as spring pollen and thunderstorm asthma, or outdoor bites and stings from snakes and spiders, please see the dedicated guides for each.

Because many of these diseases have no vaccine or cure, avoiding mosquito bites is the core of prevention. The mosquito-protection advice that Australian health authorities (healthdirect and state health departments) commonly give falls into four broad areas: reducing skin exposure, using repellent, blocking mosquitoes from getting indoors, and removing breeding sites. The tips below are general public health information rather than a specific brand, so follow official channel guidance for product ingredients and how to use them.

Unlike Ross River and dengue, Japanese encephalitis (JE) has a vaccine. After human infections were confirmed in the inland south-east in 2022, some states have run free vaccine programs for people such as those living or working in high-risk areas. However, the target groups, eligibility, and timeframes differ by state and season and change frequently — this guide does not make a determination about eligibility, and you must confirm whether you qualify with your state health department and health.gov.au and consult a GP. For records of vaccines you have already received, see the separate guide on checking your immunisation record (AIR).

• Check whether your area of residence or work is a JE high-risk area (for example, near rivers, wetlands, or pig farming facilities).
• Check the eligibility conditions for the free vaccine and how to apply on your state health department's official page.
• Consult a GP about whether and when to be vaccinated, and look up your vaccination record on AIR (the Australian Immunisation Register).

Here is a summary of the mosquito-borne diseases most often mentioned in Australia, organised by their features. Because outbreak areas and timing vary by season and year, check the latest alerts on healthdirect and your state health department. The following is general information to aid understanding, not a diagnosis.

Mosquito risk rises in spring and summer and during wet periods. When rainfall and flooding increase due to La Niña and similar patterns, there is more standing water and mosquito breeding becomes more active; in 2022, Japanese encephalitis spread into the south-east after major flooding. The following are preparation tips by season and region; for disaster response to floods, bushfires, and the like, please see the separate natural disaster guide.

• Before spring arrives (late winter to early spring), check insect screens and mosquito nets and get your mosquito-protection supplies ready in advance.
• After rain and flooding, empty standing water around your home often and check local mosquito alerts.
• People living inland, in the north, or near rivers and wetlands have a relatively higher risk of JE and MVE, so keep up with your state health department's guidance.
• Before camping, outdoor work, or visiting a farm, check your mosquito-protection preparations and vaccine eligibility in advance.
• Before and after travelling to tropical regions (such as far north QLD), take care with protection against dengue and other diseases, and if you have symptoms after returning, tell your GP about your travel history.

Here is a summary of things that are easy to get wrong. The following is general information; always confirm symptoms, testing, treatment, and vaccine eligibility with healthcare providers and official sources.

• 'It spreads between people' — Ross River, JE, and dengue are, as a rule, spread through mosquitoes and are not passed directly between people through everyday contact.
• 'It's winter, so I'm fine' — the risk is mainly in spring and summer, but in the warm north or after rain you should watch out for bites regardless of the season.
• 'Just apply repellent and you're done' — repellent is only one part; it works best combined with clothing, insect screens, and removing standing water.
• 'There's a vaccine for everything' — the only one with a vaccine is roughly Japanese encephalitis; Ross River, dengue, and MVE have no vaccine or specific cure.
• 'The free JE vaccine is for everyone' — the target groups and eligibility differ by state and season. Don't judge for yourself; confirm with your state health department and a GP.