Wow. Lots of paranoid people here.
Just a couple of FYIs. If the stuff is coming from YOUR black tank, it was stuff already in your body. Medically, speaking, you can eat your own poop with no harmful physical effect (psychological effects vary). If you have other people pooping in your black tank, all bets are off as they may harbor bacteria that is foreign to your body.
Honestly people, you will pick up more bacteria from money, products, even the doors at a gas station or restaurant than you will by having your flush hose and water hose hooked up to the same spigot. Unless the previous camper pooped on your spigot.
