CBSE - IX - Biology - Why Do We Fall Ill?
How are the diseases ,Sleeping Sickness and Kala-Azar and What are these diseases?
The tsetse fly is the host for the parasite, which is transmitted by biting. The bite is sufficiently painful for it to be noticed, but only a few of the flies carry the infection.
When the fly bites, the parasite is able to enter the bloodstream via the bite, from where it passes over into the lymph and the central nervous system.
The flagellate reproduces in the blood, and a fly that bites an infected human may therefore itself become infected, and over the course of four to six weeks this fly may infect further humans.
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