COVID-19 reinfection: A multicenter retrospective study in Saudi Arabia.

Introduction: There are limited direct data on severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) long-term immune responses and reinfection. This study aimed to evaluate the rate, risk factors, and severity of COVID-19 reinfection.

Methods: This retrospective cohort study included five hospitals across Saudi Arabia.

Measurement of the Applicability of Abdominal Point-of-Care Ultrasound to the Practice of Medicine in Saudi Arabia and the Current Skill Gaps.

Renal, gastrointestinal, and hepatic pathology, and the resources available for their management vary internationally. Whilst abdominal point-of-care ultrasound (APOCUS) should enhance management, uptake by physicians, worldwide, has been poor. So, the aim of this study was toexplore the applicability of APOCUS to medical practice in Saudi Arabia, residents' current ability to perform APOCUS, and the skill gaps.