Fever indicates that your body's immune system is doing its job because of two key reasons. One is due to the fever creating a "speed up" in white cell production and the other is due to the fever actually destroying harmful bacteria.
They feed on blood cells and cause a disease called schistosomiasis. The symptoms vary, depending on which parts of the body the worms inhabit, but can include fever, abdominal pain, coughing, diarrhea, and enlargement of the liver and spleen.
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