"The Hajj is the largest annual gathering in the world. Over two million people from nearly every country attend this spiritual pilgrimage to Mecca, Saudi Arabia. The Hajj season takes place this year between November 14 and 18, 2010.
Due to the large number of people at this gathering there may be an increased risk for certain infectious diseases such as meningococcal disease, tuberculosis, influenza (including H1N1 flu), and gastrointestinal infections. Travellers may also face a greater risk of heat exhaustion, heat stroke, and physical injuries.
Travellers should visit a travel health clinic at least six weeks before travel to get vaccines required for entry in Saudi Arabia (see Recommendations below), and assess any other travel health needs before departing."
Recommendations and more details here: Travel Health Notice
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