2020 Flashcards
what organism causes scaled skin syndrome
staphlococcus auereus
what bacterial virulence factor has an activity that results in creation of a fibrin coat around bacteria
coagulase
what is false about staphlyococcus auereus
is gram negative
what is a role that staphylokinase plays for staphylococcus auereus
cleaves C3b and IgG
what gram-positive coccus is one of the main causes of hospital acquired infections of the elderly
enterococcus faecalis
what is true about rheumatic fever
causes myocarditis in susceptible individuals
what is true about streptococcus pneumoniae
is an alpha-hemolytic, encapsulated bacterium
which of the following is NOT true regarding streptococcus pyogenes M protein
anti-M protein antibodies are not produced during an infection by streptococcus pyogenes
which of the following is true about neisseria gonorrhoeae
undergoes phase variation of Opa proteins
what factor is the most importat in allowing intravascular survival of neisseria meningitidis
bacterial capsule
which of the following is true about infections by neisseria meningitidis
preventable by vaccination against capsular polysaccharides for some meningiococcal strains
which of the following is the mostly likely characteristic of campyylobacter jejune
acquired as a zoonotic infection, often from undercooked chicken and causes a mild, self-limiting gastroenteritis
to what surface feature of enteric bacteria does the term H-antigen refer
flagella
what is not a property associated with salmonella enterica serovar typhi
produces a cholera-like toxin
bacteroides fragilis is the most frequently isolated bacterium from abscesses caused by intestinal bacteria. this is partly because
its ability to resist phagocytosis
which of the following is not a virulence factor for helicobacter pylori
shiga-like toxin
shiga toxin
removes a specific adenine base from 28s rRNA, stopping translation
which of the following is not a property of pseudomonas aeruginosa
obligate intracellular pathogen
(IS 43 C, alignate production)
what is a property of the dissaccharide-tetrapeptide component of bacterial peptidoglycan that is the tracheal ctotoxin of bordetella pertussis
it is shed from bacterial cells instead of being aboserbed and recycled
these gram positive pleiomorphic rods produce a pseduomembrane in the throat that can block in the airways
corynebacterium diphtheriae
which organism produces alpha toxin (a lecithinase-phospholipase C) and theta toxin that partially account for the organism’s tissue-destructiveness that often requires amputation to save the patient’s life
clostridium perfringens
this gram-negative coccobacillus is transmitted zoonotically via fleas and eventually infects lymphnodes where it can cause a purulent infection. in some individuals the bacteria can subsequently spread to the lungs and be transmitted by aerosol from human to human
yersinia pestis
which of the following is true for mycobacterium tuberculosis
the bacterium exhibits a very slow growth rate (doubling time of 1 day)
a positive result with an acid-fast staining test on a sputum smear is indicative of which type of bacteria
mycobacterium tuberculosis
