The causes of a lung infection are microbial agents: bacteria, parasites and fungi.
Among the various bacteria involved, there is pneumococcus that can cause pneumonia and Koch bacillus that causes pulmonary tuberculosis, Pseudomonas aeruginosa is also a very formidable bacteria. Another bacterium is Legionella, which grows in relatively warm aquatic environments (40-60 ° C) and can affect the lungs and cause severe infection. This type of bacteria can multiply in hot water circuits and cause a pulmonary infection. This happened in some hospitals ...
Another possible cause of pneumonia: viruses. These may be very common viruses: like the influenza virus that after penetrating and diffusing into the bronchopulmonary system, multiplies very rapidly. Another virus is RSV bronchiolitis, which affects mainly young children and is the cause of many emergency room entries during the winter epidemic. Many other viruses can cause a lung infection, such as the herpes virus ...
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Fungi can also be the cause of a lung infection (pneumonia), such as aspergillosis. To identify the cause of a lung infection, it is best to collect and identify in the laboratory the responsible microbial agent. But quite often, thanks to the clinical signs, and to additional examinations, a diagnosis can be made by the doctor.
See also this video:
An upper respiratory tract infection is another way of saying that a person has a cold: a cold is a minor infection of the nose and throat. Explanations in video.