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Pneumonia is caused by _____________. bacteria and viruses virus and protozoa fungi and protozoa all the choices

User Sharmeca
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OK so basically all of these would be a cause of pneumonia because each of them can affect the Alveoli by inflammation 
User Mike Ruelle
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Bacteria - The pathogen of pneumonia is streptococcus buildup in the lungs and it spreads infectiously, relating to bacteria.
User Ernst Zwingli
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