Vipers are venomous, but the scandinavian viper is not the most dangerous. Today you would simply monitor a patient and withhold treatment, and the bite will heal itself. Only if symptoms like vomiting, nausea and dizziness occur, will the patient need treatment.
The viper has many different colors
Most vipers has a beautiful zig-zag patter down their body, there are also vipers with one solid color. They can be completely black, witnessed several places in easter Jutland, and they can be brown like copper. You can tell a black viper apart from a grass snake, by looking the grass snake's two yellow spots behind their head.