Travel advice to parts of Africa has changed due to the outbreak of Ebola Virus. There are travel bans in place in some areas and Australians are being urged to reconsider their travel to affected regions, or urged to leave affected regions if already there. The Australian Government has stated:
The Australian Government advises Australians to reconsider their need to travel to Guinea, Sierra Leone and Liberia. This reflects the seriousness of the outbreak, the challenges in containing it, the limited emergency care options, and the increasing travel restrictions which have significantly reduced freedom of movement in the region. Given these restrictions we strongly advise you to consider leaving these three countries while limited commercial flights continue to operate.
Familiarise yourself with the travel advice here: http://www.smartraveller.gov.au/zw-cgi/view/TravelBulletins/ebola