High. As well with AIDS, HIV, Hepatitis A,BCand possible D. Also herpes. Anything that deals with blood and being used on multiple people could be an issue.
Also if you went to the dentist. They reuse their equipments as well
Why don't you think the office would use proper protocol? How are you so sure nothing was disinfected? I would call the office and verify their practices. An anxious mind can conjure up things that didn't really happen, I've seen it before. So, call the doctor's office and discuss their protocol.