Distribution of pathogens between HAP and VAP Download Scientific Diagram NEW: CAP, HAP, and VAP Resources Download the free charts and take the knowledge check quizzes in your Pyrls app or website today! VAP #HAP #pneumonia The diagnosis of VAP is difficult as clinical signs suggestive of pneumonia, such as fever, tachycardia, and leukocytosis, are nonspecific in critically ill patients. Moreover, particularly in Review of Hospital Acquired, Ventilator Associated, and Health CareAssociated Pneumonia in Immunocompetent Adults