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There is a lot of alarmist misinformation in the comments by turkoporto. Most endoscope users, whether ENT or in other specialities (GI, pulmonary, etc) do indeed sterilize them between uses; there are no regulatory differences between outpatient versus inpatient clinical services; and I'm pretty sure there have been no reliably reported HIV, HPV, or other STD transmissions by endoscopes, at least not in the United States. I think there was a hepatitis B (or A?) incicent a few years ago due to inadequate sterilization, after which the recommended sterilzation procedures were revised.
The bottom line: Nobody is currently at significant risk of any infection from endoscopy, at least not in the US and probably not in any other industrialized country.
You never had an exposure.
Some clarifications:
Worst case scenario = this endoscope was not sterile, was used on the previous patient who had HIV and HCV who left a lot of infected muscus/blood on the surface tube.
Cleaning = ENT doctor used standard isopropyl wipes that evaporate faster, than desinfect. Moreover, he did not entirely wipe the biological liquids from the surface.