FADOI-ICECAP is a observational, prospective, multicenter study involving 20-25 nationwide Units of Internal Medicine. The study foresees the participation of 26 Internal Medicine Operative Units, and for each of them a prospective registration of data relative to at least 50 patients admitted with CAP (in total, at least 1300 evaluable subjects) is foreseen.

Phase 1 - Patients enrollment (October 2016 - February 2018) Each Investigator have recorded data concerning 50 patients. It will be collected general characteristics of patients, clinical parameters and conditions, diagnostic imaging and blood tests,

Phase 2 - Database review and validation (April 2018 - October 2018) The data collected will be analysed to process the endpoints.

Inclusion Criteria:

1. Age > 18 years

2. Diagnosis of pneumonia defined by the presence on chest X-ray or CT-scan of lung of new infiltration associated with at least two of the following clinical features:

   • fever > 37.8°C
   • typical symptoms (dyspnea, productive cough, pain)
   • typical clinical signs on chest examination (crepitation, bronchial breathing, pleural effusion)
   • leukocytosis

Exclusion Criteria:

• patients with Hospital-Acquired Pneumonia (HAP) (i.e. those patients with pneumonia acquired in hospital more than 48 hours after admission)
• patients with tuberculosis in active phase
• patients with cystic fibrosis
• patients who refuse to participate in the study and/or to give the written informed consent.

Patients with Community-acquired pneumonia (CAP) hospitalized in Internal Medicine Units