"[2]made his most important scientific discovery very early in his career in 1964 when he discovered a natural treatment to schistosomiasis also known as snail fever or bilharzia.

He found that berries from the endod plant, which is commonly used to make soap and shampoos in many parts of Africa, is a potent, inexpensive and safe molluscicide, to prevent the spread of the parasitic worm.

Following his doctorate, Lemma returned to his home country, Ethiopia, where he obtained a position at the then Haile Selassie I University.

He found that berries from the endod plant, which is commonly used to make soap and shampoos in many parts of Africa, is a potent, inexpensive and safe molluscicide, to prevent the spread of the parasitic worm.

Lemma himself was at the forefront of this research His work acquired an international reputation, which in turn led to various awards, including honorary doctorate degrees.