USMLE Forum Archives - USMLE Step 1 - Pathology 37
Pathology 37
TheOne - 11-26-06 16:34
A 16-year-old male with sickle cell disease is hospitalized for a severe infection. His spleen has autosplenectomized and he has suffered from other minor infections in the past. His symptoms include fever, chills, cough, and chest pain. Bacteria from the patient's sputum yield optochin-sensitive organisms with a positive Quellung reaction. The organism is :
A. Escherichia coli
B. Haemophilus influenzae
C. Klebsiella pneumoniae
D. Neisseria gonorrhoeae
E. Streptococcus pneumoniae
TheOne - 11-26-06 16:34
A 16-year-old male with sickle cell disease is hospitalized for a severe infection. His spleen has autosplenectomized and he has suffered from other minor infections in the past. His symptoms include fever, chills, cough, and chest pain. Bacteria from the patient's sputum yield optochin-sensitive organisms with a positive Quellung reaction. The organism is :
A. Escherichia coli
B. Haemophilus influenzae
C. Klebsiella pneumoniae
D. Neisseria gonorrhoeae
E. Streptococcus pneumoniae
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#3
Re: Pathology 37 suresh - 11-28-06 11:53 strptococcus pneumoniae bcoz it is the most commom invading organism and characterized by quellung reaction.
#5
Re: Pathology 37
TheOne - 11-30-06 20:03 Explanation: The correct answer is E. The combination of optochin sensitivity and positive Quellung reaction are properties of a single organism, Streptococcus pneumoniae. The other encapsulated organisms that have Quellung-positive reactions are Haemophilus influenzae (choice B), Neisseria meningitidis, and Klebsiella pneumoniae (choice C). However, none of these organisms are optochin sensitive. The other choices, Escherichia coli (choice A) and Neisseria gonorrhoeae (choice D), are not encapsulated.
#6
Re: Pathology 37 galaxy - 05-28-10 02:31 A 16-year-old male with sickle cell disease is hospitalized for a severe infection. His spleen has autosplenectomized and he has suffered from other minor infections in the past. His symptoms include fever, chills, cough, and chest pain. Bacteria from the patient's sputum yield optochin-sensitive organisms with a positive Quellung reaction. The organism is :
E. Streptococcus pneumoniae
#7
Re: Pathology 37 babbu5508 - 06-21-10 15:36 E. Streptococcus pneumoniae..these are the opportunistic infections in splenectomised patients...meningococcl,pneumococcal and influenza
#8
Re: Pathology 37 bingousmle - 06-30-10 21:52 encapsulated organisms that have Quellung-positive reactions are Haemophilus influenzae, Neisseria meningitidis, and Klebsiella pneumoniae
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