A 58 year old man is brought to ED with fever, shaking chills, productive cough with reddish brown colored sputum. Temp is 40 C and respirations are 33/min. CXR shows lobar consolidation of the left lower lobe. 1. What is likely diagnosis and why? 2. What is the main protective immunologic mechanism against this organism?

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1. A 58 year old man is brought to ED with fever, shaking chills, productive cough with reddish brown colored sputum. Temp is 40 C and respirations are 33/min. CXR shows lobar consolidation of the left lower lobe. 1. What is likely diagnosis and why? 2. What is the main protective immunologic mechanism against this organism?