Pneumonia is inflammation and infection of the lungs, causing difficulty breathing, cough and chest pain. Pneumonia can either affect one or both lungs and there are various forms of the disease. The most common causes of pneumonia are: pulmonary infection with viruses (influenza, herpes simplex virus, varicella-zoster, adenovirus, respiratory syncytial virus), gram positive bacteria (Streptococcus pneumoniae, Staphylococcus aureus, Streptococcus pyogenes) and gram negative bacteria (Haemophilus influenzae, Klebsiella pneumoniae, Neisseria meningitides, Pseudomonas aeruginosa). Pneumonia can also be caused by infection with mycoplasmas (Mycoplasma pneumoniae), small infectious agents that share the characteristics of both viruses and bacteria.
When pneumonia is caused due to infection with viruses, the disease is usually less serious and generates milder symptoms. The symptoms of viral pneumonia resemble those of flu or cold: cough, headache, difficulty breathing, nausea, muscle and chest pain. Most people with viral forms of pneumonia dont need any medical treatment, as the disease clears on itself within a few weeks. If the symptoms intensify, it is a sign of...
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