SPRINT-SARI is an observational, multi-center, prospective, international study of the incidence in a short period of patients with Severe Acute Respiratory Infection (SARI) in participating hospitals and intensive care units (ICUs) worldwide. It is performed in winter in both hemispheres for a period of 5 to 7 days, enrolling patients who meet the SARI case definition who have recently been admitted to the hospitals / ICUs of the participating sites. It is intended to characterize patients with SARI as a global problem to improve information in management strategies and ultimately improve the ability of health care systems to respond quickly to emerging SARI-causing infections. The 2019 season took place from February 11 to 18 with a enrollment of 19 participants.