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A 50 yo man comes to doctor because of a chronic cough. He has smoked 1 pack of cigarettes daily for 30 years. Crackles and wheezes are heard on auscultation of the chest. A chest x ray shows no abnormalities. Gram stain of the sputum shows gram negative coccobacilli. 1. What is the most likely causative organism? Why do you think this?

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The General Principles section of the USMLE covers these topics:
Biochemistry
Genetics
Microbiology
Pathology
Pharmacology


1. A 50 yo man comes to doctor because of a chronic cough. He has smoked 1 pack of cigarettes daily for 30 years. Crackles and wheezes are heard on auscultation of the chest. A chest x ray shows no abnormalities. Gram stain of the sputum shows gram negative coccobacilli. 1. What is the most likely causative organism? Why do you think this?





 
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