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Clinical features of a respiratory tract infection may include initial symptoms of an upper respiratory tract infection mimicking a viral infection, usually associated with low-grade fevers. This may progress to the lower respiratory tract within a few days, with features often resembling those of wheezy bronchitis.
[9] [10] In humans, S. aureus is part of the normal microbiota present in the upper respiratory tract, [11] and on skin and in the gut mucosa. [12] S. aureus , along with similar species that can colonize and act symbiotically but can cause disease if they begin to take over the tissues they have colonized or invade other tissues, have been ...
The species and diversity of the microorganisms may be related to the various levels of hormones during pregnancy. Vaginal flora can be transmitted to babies during birth. Vaginal dysbiosis can lead to vaginal infections like bacterial vaginosis which makes one relatively susceptible to sexually transmitted diseases.
Prevotella melaninogenica is a species of bacterium in the normal microbiota of the upper respiratory tract. It is an important human pathogen in various anaerobic infections, often mixed with other aerobic and anaerobic bacteria. [2] P. melaninogenica is an anaerobic, Gram-negative rod, named for its black colonies, and black pigment.
Condition predisposing to anaerobic infections include: exposure of a sterile body location to a high inoculum of indigenous bacteria of mucous membrane flora origin, inadequate blood supply and tissue necrosis which lower the oxidation and reduction potential which support the growth of anaerobes.
These organisms inhabit the mucous membranes of the upper respiratory tract, mouth, vagina, and intestinal tract. [4] The genus includes commensal organisms along with some significant pathogenic species such as H. influenzae —a cause of sepsis and bacterial meningitis in young children—and H. ducreyi , the causative agent of chancroid .
The genus Klebsiella was named after the German microbiologist Edwin Klebs (1834–1913). [citation needed] It is also known as Friedlander's bacillum in honor of Carl Friedländer, a German pathologist, who proposed that this bacterium was the etiological factor for the pneumonia seen especially in immunocompromised individuals such as people with chronic diseases or alcoholics.
Like many pathogenic bacteria, S. pyogenes may colonize a healthy person's respiratory system without causing disease, existing as a commensal member of the respiratory microbiota. It is commonly found in some populations as part of the mixed microbiome of the upper respiratory tract.