Causes of Pneumonia

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Is pneumonia contagious
Both lungs are continuously exposed to particles and microorganisms, which appear in the upper respiratory tract and then enter the lower respiratory tract by microaspiration. Nevertheless, the lower respiratory tract is usually sterile due to the defensive mechanism of the lungs. These host defenses can be classified into congenital (non-specific) and acquired (specific). The occurrence of CAP suggests the defect of host defense, exposure to particularly virulent microorganisms or colonization of a large number of bacteria.

Although microaspiration is the most common pathogenesis that causes pathogens to reach the lungs, other pathogenesis also includes the spread of blood from distant infection sites, the direct spread of adjacent lesions and a large number of aspiration errors.

Toxicity factors - Some microorganisms have developed specific mechanisms to break down host lung defenses and cause infection. For example:

Chlamydia pneumoniae can produce factors that inhibit ciliary movement.

Mycoplasma pneumoniae can cut off cilia.

Influenza viruses can significantly reduce the tracheal mucus clearance rate within hours of infection and last up to 12 weeks after infection.

Streptococcus pneumoniae and Neisseria meningitidis can produce proteases capable of lysing secretory immunoglobulin (Ig) A. In addition, pneumococcus produces other virulence factors, including the capsule that inhibits phagocytosis, Streptococcus pneumoniae hemolysin (thiol-activated cytolysin interacting with cholesterol on the host cell membrane), neuraminidase and hyaluronidase.

Some species of Mycobacterium, Nocardia and Legionella can resist the bactericidal activity of phagocytes.

Physical condition of susceptible hosts - In addition to virulence factors of microorganisms, host diseases and physical conditions may lead to impaired lung defense and increased risk of CAP.  These include:

Changes in the level of consciousness [susceptible to massive aspiration of gastric contents (caused by stroke, epilepsy, drug p
Do you cough small amounts of blood when you have pnuemonia?
Hello Tamie, in pneumonia you can cough blood, however when you have blood in cough you always should take the lung cancer screening.
Both lungs are continuously exposed to particles and microorganisms, which appear in the upper respiratory tract and then enter the lower respiratory tract by microaspiration. Nevertheless, the lower respiratory tract is usually sterile due to the defensive mechanism of the lungs. These host defenses can be classified into congenital (non-specific) and acquired (specific). The occurrence of CAP suggests the defect of host defense, exposure to particularly virulent microorganisms or colonization of a large number of bacteria.

Although microaspiration is the most common pathogenesis that causes pathogens to reach the lungs, other pathogenesis also includes the spread of blood from distant infection sites, the direct spread of adjacent lesions and a large number of aspiration errors.

Toxicity factors - Some microorganisms have developed specific mechanisms to break down host lung defenses and cause infection. For example:

Chlamydia pneumoniae can produce factors that inhibit ciliary movement.

Mycoplasma pneumoniae can cut off cilia.

Influenza viruses can significantly reduce the tracheal mucus clearance rate within hours of infection and last up to 12 weeks after infection.

Streptococcus pneumoniae and Neisseria meningitidis can produce proteases capable of lysing secretory immunoglobulin (Ig) A. In addition, pneumococcus produces other virulence factors, including the capsule that inhibits phagocytosis, Streptococcus pneumoniae hemolysin (thiol-activated cytolysin interacting with cholesterol on the host cell membrane), neuraminidase and hyaluronidase.

Some species of Mycobacterium, Nocardia and Legionella can resist the bactericidal activity of phagocytes.

Physical condition of susceptible hosts - In addition to virulence factors of microorganisms, host diseases and physical conditions may lead to impaired lung defense and increased risk of CAP.  These include:

Changes in the level of consciousness [susceptible to massive aspiration of gastric contents (caused by stroke, epilepsy, drug p
My son broke 2 ribs a month ago.  He has asthma and has been having difficulty taking deep breaths.  This week he ended up in the hospital.  After 2 asthma treatments with no results, they ran tests and found fluid around his lung.  They drained 1 5 liters of fluid from around the lung.  They are saying it is pneumonia, but we are waiting for further tests.  Can pneumonia cause fluid around the lung, and not in the lung?
How can I find out which pneumonia I have
X-ray and CT can confirm pneumonia, and lab tests help to reveal the type of infection.
Can using bleach for cleaning purposes make you more susceptible to pneumonia?
Hello Diana, Chlorine gas is confirmed harmful to the lung, and can cause chemical pneumonia. You may want to use bleach material without clorine. All the best. HTQ
Are mice capable of carrying mycoplasms... and all bacteria? Is there any prevalance of one type over another?
Yes. Mycoplasma pulmonis bacteria are present in the upper respiratory tract and reproductive tract in many apparently healthy rats and mice. These animals act as carriers of the organism, spreading the bacteria during close contact (during mating or nursing young) or as aerosols through the air.
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