Hajj is the annual pilgrimage to Mecca in the Kingdom of Saudi Arabia, and is one of the
largest mass gathering events in the world. Acute respiratory tract infections are very
common during Hajj, primarily as a result of close contact among pilgrims, intense
congestion, shared accommodation and air pollution. A number of vaccines are (or have
been) recommended for Hajj pilgrims in recent years. Several additional vaccines could
significantly reduce the morbidity and mortality at Hajj and should be considered in health …