The most common causative organism for lobar pneumonia is:: (A) Staphylococcus aureus, (B) Streptococcus pyogenes, (C) Streptococcus pneumoniae, (D) Haemophilus influenzae
Answer is C. Ans. C. Streptococcus pneumoniaeThe most common organisms which cause lobar pneumonia are Streptococcus pneumoniae, also called pneumococcus. MC typical pneumonia: strept. pneumonia* MC of atypical pneumonia: Mycoplasma* MC nosocomial pneumonia: gram negative bacilli* MC early VAP: Streptococcus* MC late VAP: pseudomonas* MC VAP: pseudomonas* MC pneumonia in cystic fibrosis: pseudomonas* MC pneumonia resulting in ICU admission: streptococcus* MCC pneumonia in HIV: tuberculosis* MC pneumonia in smokers: Strept. pneumonia* MC trigger for asthma exacerbation: Rhinovirus.* MC cause exacerbation of COPD: H. influenza