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Pneumonia is a serious lung infection that has multiple causes, such as viruses and bacteria. Among the more common causes are Mycobacterium, Chlamydophila, Mycoplasma, Streptococcus, Staphylococcus, Klebsiella and viruses. In immunocompromised individuals, Pneumocystic carinii, a fungus, is a frequent cause of pneumonia. Symptoms can be mild or severe, leading to edema and inability to do gas exchange. In severe cases, patients literally drown in their own body fluids.


Cause: Streptococcus pneumoniae
Cause: Staphylococcus aureus
Cause: Rhodococcus equirhodococcus in foals
Cause: Klebsiella pneumoniae
Cause: Pseudomonas aeruginosa
Cause: Chlamydophila pneumoniae
Cause: Mycoplasma pneumoniae


Pneumocystis pneumonia