Hajj is an Islamic religious trip to Mecca, Saudi Arabia, which was visited by 1 to 3 million pilgrims annually prior to the COVID-19 epidemic.
The Hajj pilgrimage is one of the world’s largest mass gatherings, posing significant public health problems. Millions of Muslims from all over the world go to Mecca, Saudi Arabia, each year to make the Hajj pilgrimage.
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