I was bitten by a tiny rattler that I stepped on barefooted when I was 16 years old. We had just finished hiking six miles up a river canyon and set up camp. No commo. I knew it was imperative to walk out immediately. I was in pretty bad shape when we got to the car, and my girlfriend (never driven before, especially a muscle car with a four speed) almost killed us both on that mountain road in just the very few additional miles to the ranger station. The staff there got me to the hospital another 20 miles or so away.
But my foot was saved. Anti-venom is the salvation we have that so many in the third world don't.