The location – the Saudi city of Jeddah – could not be more appropriate. It is the gateway for the millions who arrive in the country every year to perform the religious pilgrimage. The hajj is one of the largest, most frequent and most diverse mass gathering. It is also a field day for disease, mainly “hajj flu” – a combination of cold symptoms, exhaustion, dehydration and malnourishment – as well as cholera, polio and meningitis.
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