My sister mistakenly stepped on a razor blade that was lying on the floor and she bled, If the person that used the razor is hiv positive, is my sister at risk? Secondly when she was fixing her hair weavon, the hair dresser who is hiv positive pricked herself with the needle she was using and it bled, there was dried blood on her hand, she used the same hand to touch my sister's wound, is she at risk