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Pneumonia is an illness (inflammation of the lung) and can have a number of potential causes. Most common are infections by viruses (e.g. influenza virus or adenovirus) or bacteria (e.g. Streptococcus pneumoniae). These are unicellular organisms. However in some cases pneumonia can be caused by parasites like the hookworm. These are multicellular.

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Q: Is pneumonia unicellular or Multicellular
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