Normal Flora of the Human Body Flashcards
The normal flora slowly develops during the first ___ years of life and as hi,am reach adulthood and maturity
3
Internal tissues or anatomic sites that do not have normal flora
muscle
brain
blood
(although DNA from microbiota has been detected in the last 2)
Fixed type of microorganism regularly found in a given area at a given time
Resident flora
Microorganisms from the environment that inhabit only for hours, days, or weeks, and do not establish itself permanently
Transient flora
Biggest and most complex habitat of for the normal flora is the:
gastrointestinal tract
Diphtheroid bacteria normally found on skin
Corynebacteria and Proprionibacteria
Gram-positive cocci normally found on skin
Non-hemolytic Staphylococcus and Micrococcus sp
T/F: Corynebacteria have been implicated in acne formation
T
What are the predominant and frequently present organisms on the conjunctiva
Diphtheroid
S. epidermidis
Non-hemolytic strep
Neisseria
S. aureus
some streptococci
Moraxella sp (resembling Haemophili)
Which pathogens presumably attach to the conjunctival epithelium by means of sialic receptors on epithelial cells?
Neisseria gonorrhea and Chlamydia trachomatis
Organisms that comprise 20% of the population in the nares
Staphylococcus aureus
other:
S. epidermidis
Corynebacteria
What are the pathologic organisms that colonize the nasopharynx
H. influenzae
Strep pneumoniae
Strep epidermidis
Neisseria meningitidis
Prominent organism of the nose
Corynebacterium
Organism that may colonize the tracheal epithelium and may become pathogenic once respiratory epithelium is damaged
Bordetella pertussis
Others that may cause infection of the LRT:
H. influenza
Strep pneumoniae
Normal flora of the nasopharynx (or URT)
non-hemolytic AND alpha-hemolytic streptococci (pneumo and epiderm)
Neisseria
Which of the following is not part of the consistent flora of the anterior urethra?
A. Proteus
B. Staphylococcus epidermidis
C. Enterococcus faecalis
D. Non-hemolytic streptococcus
A. Proteus and E. coli are contaminants from skin, vulva or rectum that may only be occasionally found
Which organism is the cause of a low pH of the vaginal epithelium preventing establishment of most bacteria?
Lactobacillus acidophilus (Doderlein’s bacillus)
During reproductive years, they are able to metabolize glycogen (from estrogen) into lactic acid
The following are important anaerobes that may become predominant in the genitalia, except:
A. Prevotella
B. Clostridium
C. Peptostreptococcus sp
D. Bacteroides
D. Bacteroides is the anaerobe in oral cavity
The organism present in vaginal flora of 25% of childbearing women that may be acquired by newborn during birthing process, causing natal sepsis or meningitis
Group B Streptococci
Which of the following is mostly likely harbored in the normal flora of infants delivered via C-section?
A. Prevotella
B. Propionibacterium sp
C. Lactobacillus
D. Sneathia
E. Atopobium
B. Propionibacterium, Staphylococcus, Corynebacterium spp found in the mother’s bacterial skin communities
These organisms are expected to colonize the oral cavity of children at the first year of age
Streptococcus mutans and Streptococcus sanguis
Which of the following is not expected to colonize the oral cavity at puberty?
A. Bacteroides
B. Spirochete
C. Staphylococcus aureus
D. Streptococcus mutans
C. Staphylococcus aureus
Organism causing dental caries
Streptococcus mutans
Others that may come into play (CAUSES DENTAL PLAQUES):
- Lactobacilli
- Actinomyces
- various proteolytic bacteria
Organisms that become established as the most prominent members of the resident flora after 4-12 hours after birth and remain so for life. They originate in the respiratory tracts of the mother and attendants, and may cause endocarditis in cases of UNCONTROLLED CARRIES
Streptococcus viridians
