This issue of Clinics in Chest Medicine focuses on Viral and Atypical Pneumonia. Editors Charles Dela Cruz and Richard Wunderlink have assembled an expert team of authors on topics such as: Epidemiology of Viral Pneumonia; Diagnostic Testing for Viral and Atypical Infections;Lung Microbiome: Atypical Infections and Viruses; RSV Pneumonia in the Young and Old;Viral infections in Chronic Lung Diseases; Viral Pneumonia and ARDS;Viruses in the Immunocompromised; Atypical Bacterial Pneumonia; Other Community Respiratory Viruses; Pandemic Viruses; Epidemic and Emerging Coronaviruses; Post-Viral Complications; Antiviral Treatments; and Vaccines in the Prevention of Viral Pneumonia.