Number of reported cases of CHIKV by country of origin and year over the study period (2008-2012)
* All CHIKV cases in Australia were acquired overseas
* The three most common identified sources were Indonesia (28.0%), India (18.5%), and Malaysia (10.0%)
The remaining 43.5% were from other countries – of which 15.0% were unknown or inadequately described at the time of notification.