” That being said, I cannot give you an exact percentage of risk but I can tell you that the risk for HIV, Hep C, MRSA,
VRE is extremely low in the situation that you describe. Regarding bacterial (MRSA, VRE), if you were exposed to one of these agents, I would expect that you would have signs and symptoms of an infection (erythema [redness] at the site of exposure, fever, chills, etc).
Did your arm have open active cuts, abrasions, or breaks in the skin and that.