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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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Group B Streptococcal Infections

Group B streptococcus is bacteria that can cause serious illness, particularly in newborns. It is responsible for many cases of meningitis, an inflammation of the membranes surrounding the brain and spinal cord, in infants, as well as some cases of blood infections (sepsis) and pneumonia.