[Health risks and advice for Hajj pilgrims].

The Hajj, the pilgrimage to Mecca, is the largest mass migration in the world. Each year, 2.5 million Muslims from over 160 countries travel to the same place, 5000-6000 of these being from the Netherlands. During the Hajj, the pilgrims undergo great physical and emotional strain. Good medical preparation including vaccinations is very important for pilgrims who undertake the Hajj, in particular for those who are older and have chronic disease. The chance of transmission of infective disease is also high and rapid contagion of Hajj pilgrims could cause a pandemic. It is therefore important that the responsible doctor is aware of the health risks to the Hajj pilgrim and his environment.