No worries !
In Vienna are no poisonous snakes at all.
All about in my country are only 2 poisonous snakes, but they are rare, only in the wildness and they are not very dangerous.
Only small kids and very old persons get in danger if got no anti-poison after bite.
In that case a helicopter would bring you into hospital in time.
Besides I am a snake expert (herpetologist) and catched hundreds really dangerous snakes by hand
.