This report discusses the RCA and implementation of intervention in health care, with a focus on preventing infectious diseases. It analyzes a scenario where a patient with a long-term urinary tract infection was admitted to a six-bedded room and cross-contaminated other patients with carbapenem-resistant Enterobacterales (CRE) infection. The report provides recommendations and strategies for preventing infectious diseases, monitoring and reassessment, and improving hygiene and infection control practices.