Odd, nothing speecial required, althiugh the World Health Organization (WHO) recommends all travellers should be covered for, Diphtheria, Tetanus, Measles, Mumps, Rubella, and Polio.
Tetanus and Diptheria require booster shots every 10 years.
Vaccination against Hepatitis A and B is also wise.
medical treatment is of a very high standard in Norway, but it's also really expensive. Europeans can get (limited) access to the health system with their Europe Health card, and Australia has a reciprocal health agreement which allows (limited) access.
Check exactly what you're entitled to, and check that you have adequate cover with your travel insurance.
We have some other safety tips for Norway here:
Phil from the safety hub about 8 years ago