Rattlesnake bites cause super venom rumor. UPI, Phoenix, June 14.Talk of super-venomous U.S. rattlesnakes was prompted by a spike in the number of seriously ailing rattlesnake victims in Phoenix, officials say.Arizona wildlife and toxicology experts say that while there may have been an increase in serious rattlesnake attacks in parts of Arizona, along with California and Colorado, a so-called super-venom was likely not involved, The Arizona Republic reported Saturday.[ See ]. Image from Themoneytime.