Pharyngitis : Causes
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Pharyngitis is caused by a variety of microorganisms. Most cases are caused by a virus, including the the common cold virus, flu (influenza) virus, adenovirus, mononucleosis, HIV, and various others. Bacterial causes of pharyngitis include Group A...
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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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A virus is an infectious agent, often highly host-specific, consisting of genetic material surrounded by a protein coat. Viruses infect virtually every life form, including humans, animals, plants, fungi , and bacteria .
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