is considered very low risk (I have read one statistic stating 1 out of 10,000 exposures will result in infection), is oral sex with a sore such as a canker sore enough to move it from "low risk" to "moderate" or even "high risk" with a known-infected partner?
Should I be concerned at what I did? Should I avoid this? Or is it likely not to be an issue?
Risks are always estimated assuming a positive partner. If the partner is a known negative, then there is no risk at all, no matter what kind of sex you are involved with. Oral sex is not a low risk,,, but a NO RISK behavior, you can not contract HIV via unprotected oral, however other STD's, including Herpes can be picked up via oral.
I'm not concerned that my canker sore was an ARS symptom (I recently just tested negative last week).
My concern was (is) that a canker sore present in my mouth would make HIV transmission orally possible. It seems logical considering the presence of broken flesh in the mouth.
However, I wasn't sure if this would still be an issue or not.