Significant features of the epidemiology of equine influenza in Queensland, Australia, 2007.

This research article discusses the 2007 outbreak of equine influenza in Australia, how it spread, and the measures taken to contain and eventually eradicate the virus.

Outbreak and Spread of Equine Influenza

Equine influenza (EI) caused by the influenza A H3N8 subtype virus spread in Queensland and New South Wales, Australia, in August 2007. The features of this outbreak include:

• The incident was traced back to horses from overseas, introducing the infection to the Australian horse population.
• The first case was detected at an equestrian sporting event, showing how easily the virus can spread in crowded environments.
• The virus continued to spread both locally and to other clusters via horse movements before any official standstill was implemented.
• There were five main clusters of infected properties during this outbreak, along with several outliers. These clusters were crucial in understanding the pattern and mechanism of disease spread.

Containment and Eradication Strategies

In response to the outbreak, several strategies were employed to contain and eventually eradicate the EI. These included:

• Queensland was divided into infection status zones. Different movement controls were applied to each zone to prevent further spread of the virus.
• Vaccination was undertaken strategically in infected areas and in certain horse subpopulations deemed to be at high risk.
• Control of the infection was augmented with quarantine measures, biosecurity precautions, and movement control to restrict the progression of the virus.
• Rapid diagnostic testing was used to quickly identify infected horses and areas, allowing for more efficient and effective containment measures.
• The combination of these strategies led to the successful control and eventual eradication of EI from Queensland.