The CDC Yellow Book is the Centers for Disease Control and Prevention's comprehensive reference guide to health issues related to international travel. It provides evidence-based recommendations and practical guidance for healthcare professionals advising travellers, as well as for travellers themselves. Topics covered include country-specific vaccination requirements, the prevention and treatment of infectious diseases, malaria prophylaxis, food and water safety, the management of travel-related conditions, and guidance for special populations, such as children, pregnant travellers and individuals with chronic illnesses. Updated every two years, the Yellow Book synthesises global surveillance data, World Health Organization guidelines and CDC expertise to help prevent illness and injury during international travel. Serving as both an authoritative clinical tool and a public health resource, it ensures safe and healthy travel worldwide. Accessed on 27/08/2025.