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Chapter 5 of the book "International Travel and Health 2007" is presented. It deals with infectious diseases of potential risk for travelers, which include food or waterborne diseases, vector-borne diseases, blood-borne diseases and sexually-transmitted diseases. It outlines the modes of transmission and general precautions of infectious diseases and describes the main infectious diseases to which travelers may be exposed and the precautions for each.

Chapter 3 of the book "International Travel and Health 2007" is presented. It deals with the environmental health risks that can be experienced by travelers. It cites the precautions for travelers unaccustomed to high altitudes, which include avoidance of overexertion and alcohol for the first 24 hours at altitude and drinking of extra water. It discusses the adverse effects of sudden changes in temperature and humidity, which include heat exhaustion and heat stroke and the adverse effects of ultraviolet radiation from the sun.

Chapter 9 of the book "International Travel and Health 2007" is presented. It looks at the health considerations of immigrants visiting friends and relatives of pilgrims. The chapter likewise discusses the health problems that can be encountered by Muslims during Hajj, the annual Muslim pilgrimage to Mecca and Medina in Saudi Arabia, which include cardiovascular disease, heatstroke and severe dehydration. It notes the airborne infectious diseases caused by overcrowding.