What Causes Pneumonia? |
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answered by NiharRaj
on Health Answers
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Pneumonia is caused by viruses, bacteria, parasites or other organisms. In most cases, the bacteria and viruses that are causing pneumonia cannot be identified. Pneumonia may be transmitted after you have breathed infected air particles into your lungs or during sleep, after you have breathed certain bacteria from your nose and throat into your lungs.
Bacteria such as Streptococcus pneumoniae, Staphylococcus aureus, Haemophilus influenzae, Chlamydophila pneumoniae, Legionella and Mycoplasma pneumonia (walking pneumonia) can cause pneumonia. Viruses such as the influenza A (the flu virus) and parainfluenza, respiratory syncytial virus (RSV), adenovirus, SARS, measles and chickenpox virus can also cause pneumonia. Some forms of fungi and parasites such as Pneumocystis carinii often causes pneumonia in people with compromised immune systems such as those with AIDS.
Aspiration pneumonia occurs when you have breathed food, liquid, gastric juices or vomit into the lungs – this may happen if you have had a stroke, Parkinson’s disease or a seizure which makes it difficult for you to swallow. Pneumonia may also develop during the course of your daily life such as at work, school or gym (community-based pneumonia) or if you are hospitalized or at a nursing home (hospital-based pneumonia).
People age 65 years and older as well as very young children have a higher risk of developing pneumonia because their immune systems are weak or under developed. |
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