Organ donation takes healthy organs and tissues from a donor and transplants them into a recipient. Most donations occur after the donor has died but some can be donated while alive. Organs cannot be stored and must be used within hours of removing them from the donor's body.

Internal organs that you can donate include kidneys, liver, pancreas, heart, intestines and lungs. Transplantation is often used to treat end-stage kidney disease. Diabetes is the most common cause of kidney and pancreas transplantation.

Onchocerciasis, or river blindness, is a parasitic eye and skin disease. It is caused by a worm (filaria) and is transmitted to humans through a type of biting blackfly. These flies breed in fast-flowing streams and rivers within intertropical zones, increasing the risk of blindness to individuals living nearby.