For the most recent updates:
Australian Veterinary Association

For a range of Hendra fact sheets:
Queensland Horse Council

For information on latest outbreaks, background, research, guidelines for vets, guidelines for holding equestrian activities, horse and donkey biosecurity.

Details of who to contact if you suspect Hendra virus in Queensland.
Biosecurity Qld

Thorough information on the disease in both horses and humans, including prevention, transmission and symptoms, by Queensland Health
“Hendra Virus Infection”

Other links:

Queensland Department of Primary Industries

Equine Veterinarians Australia

Australian Stud Book