Burger suspects he was bitten by tsetse flies while walking through game parks.
Washington Post(Dec 22, 2016)
People are generally infected by the bite of an infected tsetse fly, which transmits the parasites.
US News(Oct 03, 2016)
African sleeping sickness, also known as African trypanosomiasis, is caused by a microscopic wormlike parasite spread exclusively by the tsetse fly.
Science Magazine(Sep 23, 2016)