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A routine chest X-ray is not always necessary for people who have symptoms of a lower respiratory tract infection. [4] Influenza affects both the upper and lower respiratory tracts. [citation needed] Antibiotics are the first line treatment for pneumonia; however, they are neither effective nor indicated for parasitic or viral infections. Acute ...
Bacteria are unicellular organisms present on Earth can thrive in various environments, including the human body. [14] Antibiotics are a medicine designed to treat bacterial infections that need a more severe treatment course; antibiotic use is not recommended for common bacterial infections as the immune system will resolve such infections. [15]
Bacterial and viral cases of pneumonia usually result in similar symptoms. [25] Some causes are associated with classic, but non-specific, clinical characteristics. Pneumonia caused by Legionella may occur with abdominal pain, diarrhea, or confusion. [26] Pneumonia caused by Streptococcus pneumoniae is associated with rusty colored sputum. [27]
The most common causes of CAP vary depending on a person's age, but they include Streptococcus pneumoniae, viruses, the atypical bacteria, and Haemophilus influenzae. Overall, Streptococcus pneumoniae is the most common cause of community-acquired pneumonia worldwide. Gram-negative bacteria cause CAP in certain at-risk populations. CAP is the ...
[5]: 28 Most infections are viral in nature, and in other instances, the cause is bacterial. [6] URTIs can also be fungal or helminthic in origin, but these are less common. [7]: 443–445 In 2015, 17.2 billion cases of URTIs are estimated to have occurred. [1] As of 2016, they caused about 3,000 deaths, down from 4,000 in 1990. [8]
The combination of cell destruction and fluid-filled alveoli interrupts the transportation of oxygen into the bloodstream. In addition to their effects on the lungs, many viruses affect other organs. Viral infections weaken the immune system, making the body more susceptible to bacterial infection, including bacterial pneumonia.
The most common lower respiratory tract infection is pneumonia, an infection of the lungs which is usually caused by bacteria, particularly Streptococcus pneumoniae in Western countries. Worldwide, tuberculosis is an important cause of pneumonia.
480 Viral pneumonia. 480.31 Pneumonia, SARS associated coronavirus; 480.9 Pneumonia, viral, unspec. 481 Pneumococcal pneumonia; 482 Other bacterial pneumonia. 482.9 Pneumonia, bacterial, unspec. 483 Pneumonia due to other specified organism 483.0 Mycoplasma pneumoniae; 485 Bronchopneumonia, organism unspecified; 486 Pneumonia, organism ...