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The World Health Organization's Guide to Ship Sanitation serves as the global standard for health requirements in ship construction and operation, referenced in International Health Regulations. Its primary aim is to standardize sanitary measures on vessels, protecting the health of travelers and crew, and preventing the international spread of infections. This revised third edition addresses changes in ship design and size since the 1960s, as well as the emergence of new diseases not anticipated in earlier publications. The guide is structured into chapters covering critical topics such as water safety, food safety, recreational water environments, ballast water management, and waste disposal.