Future mosquito-borne disease threats in Australia (#88)
Mosquito-borne disease management in Australia
faces challenges on many fronts. Gaps exist in our understanding of the drivers
of endemic mosquito-borne disease risk and the pathways of exotic mosquitoes
and pathogens. Ross River virus (RRV) is the most commonly reported
mosquito-borne disease in Australia and while not fatal, can cause a
potentially severe flu-like illness with an average of 5,000 cases reported
each year. There is annual activity of dengue but with limited distribution of
suitable mosquito vectors (e.g. Aedes
aegypti), locally acquired cases are restricted to Far North Queensland.
However, there is a steady increase in imported cases of both dengue and
chikungunya virus infections highlighting the potential for exotic
mosquito-borne pathogen incursions. With the potential for temperate climate
tolerant exotic mosquitoes (e.g. Aedes
albopictus) introductions, there is a potential risk for future outbreaks
of exotic diseases in Australia’s southern regions. Notwithstanding the threat
of exotic pathogens, endemic virus including RRV and Barmah Forest virus (BFV) continue
to pose a risk but outbreaks are difficult to predict due to the complex
diversity of mosquito vectors, environmental drivers of mosquito abundance and the
role of wildlife reservoirs. Predicted changes in climate combined with the
encroachment of new residential developments into wetland habitats and expansion of wetland
rehabilitation projects may increase exposure of the community to
mosquito-borne disease. Environmentally sensitive mosquito control strategies
may be required to reduce the risks where suitable mosquito habitats and
wildlife occur close to residential developments. However, an emphasis will
remain on the awareness raising programs of local health authorities informed
by mosquito, pathogen and human disease surveillance. Personal responsibility
for avoiding mosquito bites will be promoted but with that should come a
greater understanding of how the community choose and use mosquito repellents.
Understanding the effectiveness of these approaches will be critical in
assessing and addressing future mosquito-borne disease risk in Australia.