Community acquired pneumonia is a well-known entity in internal medicine. It represents 1.2 cases per 1000 inhabitants every year, and up to 14 cases per 100 inhabitants in people older than 65 years old. Despite our exposition to the disease almost daily, it is still the leading cause of death related to an infection. In 2019, The American Thoracic Society proposed a revision of its guidelines, especially concerning the diagnosis and the treatment of community acquired pneumonia. It is the latest academic society revision. Further-more, the SARS-CoV-2 pandemia has extended our knowledge of pulmonary infection and brought an adaptation of our practice.