Dave, Necrotic tissue eating venom is nasty stuff...
We have a rattlesnake that looks a lot like a Western Diamondback but it is Mohave Rattlesnake/Mohave Green Rattlesnake/Mohave Viper. Few can tell them apart.
It has neurotoxin venom instead of the traditional hemorrhagic venom that makes you swell up and have tissue death. Well, it takes 10-12 hours for that neurotoxin to do its magic and it then shuts down your respiratory system and your heart when the venom starts doing its nasty side effects. If you haven had the antivenom hours and hours before then you are dead as there is Not anything they can do to keep you alive when it starts shutting down your system. The antivenom was something like $2500-2800/vial about 10 years ago when I first read about it. Cannot imagine the expense now. You are probably gonna need about a dozen or more vials of that antivenom too. So, "dry bite" from a Western Diamondback is typically treated as a Mohave Viper...
Nasty business animals like that and many in your country equally or more lethal.
Stay safe...
