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The list of organisms that can cause pneumonia is very large, and includes nearly every class of infectious organism: viruses, bacteria, bacteria-like organisms, fungi, and parasites (including certain worms). Different organisms are more frequent...
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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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