http://www.venomousreptiles.org/articles/97
The odds of you having an allergic reaction to snake venom is very slim.........unless you have been previously subjected to the venom.
The swelling from a hognose bite is from venom produced in a venom gland - not toxic saliva. The swelling and discomfort associated with a hognose envenomation is due to the venom - not an allergic reaction.
http://www.venomdoc.com/forums/viewt...ight=heterodon
Again, read up on venom allergies - they are due to previous exposure to the venom. The most common vehicle of this exposure is through the nose (dried venom inhalation during cleaning and handling) and is somewhat common to species that produce copious amounts of venom (and get is smeared or scattered in their cages).
Heterodon are not one of these species.