Hepatitis on a Knife?

Ok, you may remember me. I was paranoid awhile back about hepatitis. I have been good about it for awhile now. However I had an incident today that has caused minor concern. Maybe someone can help me.

I was making lunch, and cut my thumb with a knife. It bled a bit, and I took care of it and all that.
My question is, how effective are home automatic dishwashers at getting hepatitis off utensils?

Meaning if the knife sat in a sink for awhile where friends or extended family members had been placing their dirty utensils with it, and dumping their glasses of water and such in there. And may have been using the knife as well(i doubt they cut themselves with it, but i cant say for sure), how safe is this knife after going through a dishwasher cycle? I had just taken the knife out of the dishwasher, as it had gone through the cycle either last night or early today.

Hope someone can help me out here. Thanks!