In the 13 years since the American Thoracic Society and Infectious Diseases Society of America have issued guidelines for the treatment of community-acquired pneumonia much has changed, resulting in a new guideline with 16 major recommendations. These are reviewed by Maylyn Martinez, MD, from the Department of Medicine at the University of Chicago and JAMA Network Open Associate Editor Angel Desai, MD, from the Department of Medicine at the University of California at Davis. Related Article: Diagnosis and Treatment of Adults With Community-Acquired Pneumonia