exposure to blood does present a risk to others such as hepatitis b as just one example. breathing over fresh blood is unlikely to pose any particular risk since pathogens rarely if ever will aerosolize from a simple smear or spill. touching blood especially if you have any open wound could pose measureable risk. this co-worker needs to stop exposing others and of course any contact with this or anyone's blood for that matter requires that you wash carefully and thoroughly with soap and running water afterwards. if this person has a contagious blood-borne disease that poses risks to others he/she has a moral responsibility to disclose this risk.
can you get anything from touching blood or breathing over blood? . a co worker bleeds everywhere and we accidentally touch it with our hands or arms. he has claimed that he has everything a person could possibly get. should we have blood test done for any reason due to this co workers obsessive bleeding?