The most common pathogens responsible for nosocomial pneumonias in the ICU are -: (A) Gram positive organisms, (B) Gram negative organisms, (C) Gram negative organisms, (D) Virus infections
Answer is B. Ans. is 'b' i.e., Gram negative organisms "Hospital-acquired (nosocomial) pneumonia is frequently caused by enteric gram-negative bacilli such as E.coli, pseudomonas aeruginosa".