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Protozoa causes...

Protozoa causes

A

malaria

B

Kala-azar

C

sleeping sickness

D

All of these

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### Step-by-Step Solution 1. **Understanding Protozoa**: Protozoa are single-celled organisms that can cause various diseases in humans. They are classified as parasites when they live in or on a host and benefit at the host's expense. 2. **Identifying Protozoan Diseases**: - **Malaria**: This disease is caused by the protozoan parasite *Plasmodium vivax*, which is transmitted to humans through the bite of infected female Anopheles mosquitoes. Symptoms include fever, chills, and flu-like illness. - **Black Fever (Kala-azar)**: This disease is caused by the protozoan *Leishmania donovani*. It primarily affects internal organs such as the spleen, liver, and bone marrow, leading to symptoms like fever, weight loss, and anemia. - **Sleeping Sickness**: Caused by the protozoan *Trypanosoma brucei*, this disease is transmitted by the bite of the tsetse fly. Symptoms include fever, headaches, joint pains, and neurological issues leading to sleep disturbances. 3. **Summarizing Protozoan Diseases**: The main protozoan diseases mentioned are Malaria, Black Fever, and Sleeping Sickness. Each of these diseases is caused by specific protozoan parasites and transmitted through different vectors. 4. **Conclusion**: Protozoa cause various diseases in humans, and understanding these diseases is crucial for prevention and treatment.
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