so i want to keep some hognoses.

[Skiploder]

Again, a common misconception... And it also depends on what you consider harmless...

I can direct you to atleast 4 individual accounts where the effects of the bit were medically significant...

Trust me, I used to feel the same way but the reality of it is, is that you can have a bad reaction that points to envenoming, not an allergic reaction...

In at least two of the documented accounts the person bitten suffered from some long lasting effects from the bite...

You may also want to contact Wolfgang Wuster and Bryan Grieg Fry about the venom of a hognose snake and its potential...

Here is a photo of a bite from a harmless hognose snake...

Here's what Dr. Fry has to say on the subject:

http://www.kingsnake.com/toxinology/...ight=heterodon

http://www.kingsnake.com/toxinology/...ight=heterodon

http://www.kingsnake.com/toxinology/...ight=heterodon

Where's the potential?

And if you can find the potential, the potential for what?

The whole allergy thing is blown out of proportion when it comes to rear fanged snakes.

Are hognoses venomous? Yes.

Is their venom medically significant? According to one of the people you cited (Fry) - no.