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NBME 7 q - immuno- Can anyone please explain - 3usmlesteps
#1
block 3-50-

a 3 year old boy is brought to the physician by his parents because of fever sore throat malaise and lethargy for 2 days. He and his family recently immigrated to the USA and he has not received any routine childhood immunizations. his temperate is 39. 4 C./ Physical examination shows an erythematous pharynx with patches of a tough gray membrane like material that bleeds if it is removed. there is cergvcial lymphedenopathy. A Throat culture grows cornybacterum diphteria. Immunization with which of the following wiuld most likely have prevented this illness?


a- capsular polysaccharide
b- M protein
C- outer membrane protein
d- protease
e- toxoid
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#2
ans E because DPT vaccine is composed of Tetanus Toxoid, Diphteria Toxoid and Killed pertussis
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#3
i think c
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#4
sorry mistype its e
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#5
Its e toxoid
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#6
Coryne diphtheria: triad: gray pathches .. that are seen in the pharynx...

answer is E. ) toxoid.
exp: it could have been prevented by the toxoid vaccine which is part of DTAP vaccine
Dtap vaccine consists of toxoid, tetanus, diphtheria, ..

hope it helps.
thx
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#7
other answers:
a- capsular polysaccharide
b- M protein
C- outer membrane protein
d- protease
e- toxoid

a) is seen is Neisseria gonn
b) seen in strep pyogenes
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#8
thank you so much guys!
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