Bloodfangs are, simply put, vampires that come in a variety of forms. They don't have the ability to turn into a bat and they aren't undead like the vampires you may be familar with but they do require consumption of blood or they will die. They also have a weakness to sunlight due to increased sensitivity to UV rays, where they get sunburned much more easily and quickly.
Therefore a bloodfang must put on sunscreen before heading outside on a sunny, or even partly sunny day.
They also have super human strength and movement speed, some even moving faster than the speed of sound!
If a bloodfang and a non-bloodfang have children together, you get what is known as a daywalker who may have some traits from both parents which can include super-human abilities.
It's caused by a disease that can not be cured. The origins of the disease are unknown but is believed to have been caused by ticks.
Not all bloodfangs are human, they can be other things as well.
From the scientific