<prompt> The most common pathogen in ventilation associated pneumonia:Staphylococcus AureusPseudomonasEnterococciStreptococcus  <response>: Two most common pathogen FOR ventilator Asssociated Pneumonia - 1 Staph Aureus 2 Pseudomonas Aeruginosa Pseudomonas Aeruginosa is more common among two. 