Which trial do we need? Combination antimicrobial therapy for hospital acquired bacterial pneumonia caused by Pseudomonas aeruginosa Clinical Microbiology and Infection Pneumonia (CAP HAP VAP) : Review of Hospital Acquired, Ventilator Associated, and Health CareAssociated Pneumonia in Immunocompetent Adults CAP 2019 HAP VAP 2016 Ref. https: www.idsociety.org practice guideline community acquired pneumonia cap in adults https: www.idsociety.org practice guideline hap_vap Changes in Therapy Recommendations in the 2019 ATS IDSA Guidelines for Community Acquired Pneumonia Contagion Live Immediate vs. culture initiated antibiotic therapy in suspected non severe ventilator associated pneumonia: a beforeafter study (DELAVAP) Annals of Intensive Care Springer Nature Link