Shakari you are correct. African logistics are definately more difficult.In some Texas areas access can be 3-4 hours by vehicle especially down in the big bend. I understand well the logistics of Africa having hunted in Zambia and Tanzania and visited some clinics. Antivenom would likely not be available in the majority of clinics/hospitals except at the majors.This does not change the current guidelines/ recommendations for treatment and all the more reason to have medivac insurance.
My daddy's prevention guidelines are probably more germane..."Watch for snakes, watch where you put your feet,don't put your hands into holes, if an area looks snakey it probably is"

I was impressed at how fast and aggressive the mamba are... I recieved a large knot on my forehead when the cruiser came to an abrupt halt one day in the Selous. The driver had braked suddenly to avoid running over a large mamba. In Texas we accelerate for snakes on the road. Not a good idea with mambas!