In Australia,there are two levels of nurses---one level have Degrees,the other level don't.
And a "Doctor" is normally just a Bachelor of Medicine---they are not Doctors in the University sense!
So that's completely different from here.
The doctor/arts has an University degree (7 years)
Nurse diplomas exists in 2 major categories. Secondary and Bachelor.
People without degree do the cleaning of the rooms and transport patient beds between departments.
There exists something that could be translated as assistant-nurse, the cannot inject/give pills/other, but even that requires a diploma.
I did not mean to imply that the "Doctor" who looks after you medically doesn't have a University Degree.
He/She is usually "A Bachelor of Medicine".
Most GPs don't have a Doctorate as the title is used in other fields--"Doctor of Philosophy","Doctor of Science","Doctor of Divinity",etc.
Re Nurses:- In my home State of Western Australia,there are two levels of Nurses,both of which can add extra oroficiencies as they progress through their careers.
Enrolled Nurse:- These Nurses have a Diploma from a TAFE College or similar qualifications.
Registered Nurse:-RNs have a Bachelor of Nursing Degree from a University.
A "Nurse Practitioner" is a a RN who has achieved the Degree of "Master of Nursing" at University.