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Viral infections such as mumps often affect the salivary glands (mumps most often causes parotiditis). This type of infection is now considerably rare in children because of the MMR vaccine.
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A virus is an infectious agent, often highly host-specific, consisting of genetic material surrounded by a protein coat.
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Bacteria are prokaryotes (unicellular organisms with no membrane-enclosed nucleus) with simple structures that typically range in size from about 0.5 to 20 micrometers.
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