No anti-venom is 100% garanteed to do the job safely and effectively, there are alot of envenomations where symptoms are treated without anti venom, its certainly not a miracle cure there are many problems that come with administration of AV, obviously serious bites are treated with AV because theres no other treatment thats as effective, but its not without its problems.
Also theres snakes on the DWA list that haven't killed anybody at all, but they are still front fanged venomous snakes, some vipers and some elapids as well. Copperheads as a general rule, because theres not that much variation between the venom of the 5 subspecies, are non fatal but people envenomated are still in a whole world of pain, loss of digits and hospital treatment is commonly needed, they are a snake that alot of people don't take seriously because they hear about them being non fatal, but they are dangerous. No one has died from an exotic snake bite here in the UK for a great number of years, but that doesnt take away the dangerousness of the snakes that people have been bitten by, you just have to commend the doctors here in the UK that treat the envenomations.
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