My 4 year old got a haircut yesterday. She used buzzers. She had previously used them on a guy a half an hour before, then she cut my daughter's hair and then my 4year old's hair. She did not clean the buzzers I watched her. I specifically asked her not to use them on my son (cause I knew they were not cleaned) but at the end she picked them up and did before I could stop her. It had been about 30 minutes since she had used them. Any chance my son could have been exposed to hiv from this. If there was blood on them and all.