Queensland Health has a number of resources available with information about the virus and what measures can be put in place to contain its spread.
This includes posters and fact sheets about personal hygiene, stopping the spread of germs and proper handwashing techniques. These can be distributed to employees or displayed in packing sheds or other areas of your farm. The posters are available in English and other languages.
View them here
There are also cleaning and disinfection recommendations here
Queensland Heath advises that the virus is contagious if a person spends 15 minutes in a confined area with a person carrying the virus or two hours in more open spaces.
It can remain contagious on surfaces for up to 12 hours. Any employee who has worked in close proximity to a confirmed case will be at high risk of exposure.