Bovine Ephemeral Fever, commonly known as 3 day sickness, is a significant disease affecting cattle in northern Australia. It is caused by a virus and transmitted by mosquitoes and biting midges. It is often seen after heavy rainfall and flooding which provides favourable conditions for insect populations to increase.
The disease manifests in three stages. Stage one includes sudden onset fever, shivering, depression, abnormal posture, drooling, discharge from eyes and nostrils, Cow down with 3 day sickness reduced feed intake, and diminished milk production.