Surely the heights of ignorance that I encountered the other day could not possibly be surpassed by any that I have encountered so far:

Dr: can I ask you a question?
Me: sure.
Dr: you see, I am very worried.
Me: oh? Why?
Dr: well…. The other day I performed a ultrasound examination on the abdomen of a patient with HIV.
Me: ok, so what’s the problem?
Dr: I want to ask is there any chance I will get HIV from the patient?
Me: ugh….no. HIV is transmitted via exchange of infected body fluids via direct entry through either a contaminated needle or transfusion and through sex with an infected person.
Dr: so, there is no chance I will get infected right?
Me: ugh… No.
Dr: oh thank you very much. I feel much better now.