How will giardiasis and sleeping sickness spread?

Tse tse flies. Sleeping sickness is an infectious disease found in Africa, rarely in the US, and spread by being bitten by Tse Tse flies. Giardia is also an infectious disease, spread by drinking infected water. Giardiasis can also be acquired person to person contact; anal sex is a risk factor.
Fecal-oral. Giardia is transmitted from contaminated food. The kind of sleeping sickness that is transmissible is a parasite.