Lec2 Flashcards
is a term used to describe bacteria and fungi that are permanent residents-of certain body sites, especially the skin, oropharynx, colon, and vagina.
Normal flora/ commensals / permanent residents
are usually not considered members of the normal flora because they harmful.
viruses and parasites
internal organs usually are
sterile
implies that an individual harbors a potential pathogen and therefore can be a source of infection to others. It sheds it for a long-period and no one notice.
carrier
- A person with an asymptomatic infection.
- Apperson who has recovered from a disease but continues to carry the organism
types of carriers
who is provide to the host producing vitamin Bs and vitamin K.
intestinal-flora
Harmful functions of commensals
1.Can cause diseases for the immunocompromised individuals.
2. Can be pathogens if changed location to other parts of the body.
are colonized by nonpathogenic streptococci, staphylococci, and Neisseria. They occupy attachment sites on the mucosa and inhibit the growth of the pathogens
nose and throat
can cause dental plaque
in mouth
Streptococcus mutans
Whu stomach contains few organisms
because of its acidity.
More than 90% of the fecal flora are
anaerobes
Example of anaerobes bacteria for faceless flora
Bacteroides fragilis
cause urinary tract infections when change location.
E. coli
causes perforation of the intestinal wall causing
peritonitis
Bacteroides fragilis
infects the hospitalized patients.
Pseudomonas aeruginosa
Why lactobacillus found in vagina
● to keep low pH inside
● preventing growth of potential pathogens
Urine in the bladder is sterile due to the
presence of uric acid.
