Tsetse Flies Are Parasites That Live Off Fresh Blood They

Tsetse flies are parasites that live off fresh blood they obtain by biting their hosts in hot, humid areas in Africa.Their natural hosts are wild pig and bushbuck, a type of antelope, but they have a broad host range.A second parasite, Trypanosoma brucei, is a unicellular organism that spends part of its life cycle in the tsetse fly.This microorganism causes African sleeping sickness in humans and is transmitted into human blood through the bite of a tsetse fly.Humans are increasingly moving into regions where the tsetse fly lives.This has increased deforestation of the natural habitats of pigs and bushbucks, which has caused declines in their populations.Listed below are several possible outcomes of these changes.Evaluate the likelihood of each of the outcomes listed, and select the most likely outcome.

A) Tsetse fly populations will decline, causing a decline in Trypanosoma brucei infections in humans.
B) The symptoms of African sleeping sickness in humans will decrease in intensity and duration.
C) African sleeping sickness incidence in humans and livestock will increase.
D) The tsetse fly will lose its ability to transmit Trypanosoma brucei to humans.
E) Trypanosoma brucei will move to a new host other than the tsetse fly.

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