ord
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A 24 year old woman is brought to the ER because of a 3 day history of migratory polyarthritis. Over the past 24 hours, she has become unable to walk because of a tenosynovitis of the right patella. Exam of fluid from the right knee shows 50,000 leukocytes/mm3. A gram stain of this fluid and a cervical exudates show gram negative diplococci. Analysis of her serum for complement activity indicates that a total hemolytic complement activity is only 5% of normal. A deficiency in which of the following complement proteins enhanced the likelihood of this infection in this patient?<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
a)activating enzymes (c1r, c1s, c2b, Bb, D)
b)complement receptors (CR1, CR2, cr3, cr4, c1qR)
c)membrane attack complex (c5b, c6, c7, c8, c9)
d)membrane binding proteins(c4b, c3b)
e)peptide mediators of inflammation(c5a, c3a, c4a)
C?
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