Clinical infectious diseases : an official publication of the Infectious Diseases Society of America
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The Hajj is the oldest and largest annual mass gathering in the world and may increase the risk of spread of respiratory viruses. ⋯ This study suggests a rapid acquisition of respiratory viruses among pilgrims during their stay in the KSA, most notably rhinovirus, and highlights the potential of spreading these infections in the pilgrims' home countries upon their return.