After lunch i was chatting with my friend who has been under HIV HARRT for 1 year and his virus load is not detectable.He used toothfloss to clean his teeth and brushed his teeth.when he talked to me,his seliva,only a small drop dropped into my eye.Do I need to worry?what if there was small amount blood in his seliva?He and I are very close friend,I do not want to let him know that I am worried about this,do not want to hurt his feeling.Anybody helps me?thank you.