I didn't think Kenshin got stabbed that often.TallonKarrde23 wrote:i think having a sword covered in blood shoved into your own blood system is a pretty good way of transmitting them
You can bathe in a tub of blood without getting a blood-carried disease. You have to have an open wound, or have it in your mouth and cuts in your mouth, in order to get the disease. And there is a time limit during which that infected blood must find a way to get into your bloodstream.
Now, if Kenshin is cut open and the other person's blood pours onto that wound, he's almost certainly going to get any transmittable diseases the other person has. And if he gets showered by lots of people - on an open wound - he has an excellent chance of getting a blood-carried disease.
But AIDS was not common in Japan at that time. The chances of someone he killed (and whose blood fell on an open wound of his) being infected with AIDs in particular are slim. Other blood-transmitted disease? Absolutely. As long as he was cut when he did the cutting of others, and that blood fell on his cut.