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NBME 23 Answers

nbme23/Block 1/Question#21 (47.2 difficulty score)
A 40-year-old woman with a history of ...
Bacterial pneumonia🔍,📺
tags: rituximab cd_markers 

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submitted by thomasalterman(161),
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ehS stuj cteleopdm the rocsue fo auirbmixt, hwhic rgtatse CD02 t.orcrepse ellc-B ifccindyee nac sepispoedr to aetrilacb

b) MB ufailer si nto docasaeist hwit ar) timuxcbi o)drgn w wre og)n tihs urocsc w/in -071 days fo aginrtts ratettn,em dan duwlo ont curco rfate emgpnctiol a t-4onmh oseruc fo abimxi.rtu

meningitis  Forgot the time frame for Serum sickness and got it wrong.. thanks @thomasalterman +20  
stinkysulfaeggs  Same. Crap. +2  
medstudent22  Taking it one step further - B-cell depletion = decreased Ab secretion = decreased opsonization. Opsonization with subsequent phagocytosis by spleen = #1 mechanism by which encapsulated bacteria (ie Strep Pneumo) are degraded. +1  

submitted by abhishek021196(79),
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mniaehMcs = aoncnolloM ndbtyaio aisagtn 2DC,0 chhwi si fuodn on otsm lBe-lc penso.amsl

eUs = ll-Bec ndNokn-ioHg ,pymlmhoa LL,C I,PT mirodaethu htir,asrit T,TP A,HIA M.S

dvA tceffse = erdencaIs iksr of vepssiegorr ltuflimcao aeyetaclhlknehpouop in ntateips whti CJ sriuv.

tyrionwill  low IgG in response to infection/vaccination leads to broad bacteria and virus infection or reactivation. bacteria: strep pneumonia, Hib virus: JC, HBV, CMV... +