Both bacterial and viral infections lead to fevers, but a key difference between them is that with viral infections the fever develops and then declines after a few days but in the case of a bacterial infection the fever may intensify. As a rule, bacterial infections produce fevers that are higher than those caused by viral infections. However, the viral flu may also cause a very high fever. Once again, the patient needs to get a competent medical diagnosis to know for certain which kind of infection they have.
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