The field would suit you well. Your specialisation in microbiology and your profession is the closest fit for the field than any premed course.
Our medical curriculum accepts any 4 year bachelors of science as a prerequisite so even engineers can study medicine here.
The only patient contact I have experienced is during a fine needle aspiration procedure or talking to patients why they need to have additional slides stained for immunohistochemeistry just to rule out other diagnosis. Other than than, it's just talking to colleagues, admin staff, surgeons, medical lab technicians and corpses most of the time.