Direct contact
This includes skin infections such as ringworm and bacterial diseases which can infect humans through entry through cuts, wounds or mucous membranes directly from infected animals or via contaminated sources such as water.
Examples: leptospirosis, Australian Bat Lyssavirus
Aerosol
Inhalation of bacteria dispersed in the air or dust can also cause disease.
Example: Q fever
Ingestion
Ingesting disease agents is another mechanism for contracting disease. This can occur through eating or drinking contaminated food or water or by having the infective agent on your hands before eating.
Insect bites
These can transmit diseases straight into the body or blood steam.
Examples: Ross River fever, Murray Valley Encephalitis.