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Despite their microscopic size, viruses are responsible for many childhood illnesses. When viruses invade human cells, they take over the cell's machinery to reproduce. As they grow in number they can cause illnesses, some of the serious.

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Fungal Diseases

At times, children may become infected with fungi that only rarely infect people. In many instances, the children most susceptible to these infections have weakened immune systems because of cancer, chemotherapy, corticosteroids, organ transplantation, or an HIV infection.