bacteria. Which one of the following bacteria is found in the
greatest number in the colon?
(A) Bacteroides fragilis
(B) Clostridium perfringens
(C) Enterococcus faecalis
(D) Escherichia coli
(E) Lactobacillus species
to you complaining of fever and pain in that joint. You are
concerned about an infection by S. epidermidis. Using your
knowledge of normal flora, what is the most likely source of
(A) Dental plaque
of rheumatic fever who has had fever for the past 2 weeks.
On examination, you find a new heart murmur. You suspect
endocarditis and do a blood culture, which grows a viridans
group streptococcus later identified as S. sanguinis. Using
your knowledge of normal flora, what is the most likely
source of this organism?
aureus has occurred in the hospital. The infection control
team was asked to determine whether the organism could be
carried by one of the operating room personnel. Using your
knowledge of normal flora, which one of the following body
sites is the most likely location for this organism?
(B) Gingival crevice