In america doctors don’t take the Hippocratic oath anymore.. Doctors of medicine still take a modified version, but “Doctors of Osteopathy” take their own special oath where they have this wonderful little section which does a LOT of heavy lifting:

…to employ only those recognized methods of treatment consistent with good judgment and with my skill and ability, keeping in mind always nature’s laws and the body’s inherent capacity for recovery.

I will be ever vigilant in aiding in the general welfare of the community, sustaining its laws and institutions, not engaging in those practices which will in any way bring shame or discredit upon myself or my profession…

And, as I’m sure you can imagine, this leaves open to the interpretation of the reader what constitutes “natural law”, “good judgment”, the “general welfare of the community”, or “practices which will bring shame or discredit”.

Also, those Osteopaths, who are not even considered doctors in many international jurisdictions, still swear to hold to the principles of Osteopathy, a pseudoscientific quackery which says that anything your body needs to heal can be produced by your body. I’m sure you can guess how that relates to vaccines.