Table 1.

Main settings and selected examples where invasive meningococcal disease outbreaks have occurred in association with a mass gathering or other over-crowded setting

Setting	Example and reference	Country of origin	Year of outbreak
Religious pilgrimage	Hajj and Umrah22	Saudi Arabia	1987, 1992, 1997, 2000, 2001
Ceremonial gathering	Funeral23	Liberia	2017
Sporting event	International youth football tournament24	Belgium	1997
Other gatherings of adolescents/young adults	World Scout Jamboree25	Japan	2015
	School bus26	Australia	2005
	University campus27	USA	2013–2018 (10 outbreaks)
Refugee population	Refugee camp28	Italy	2015/2016
Military personnel	Military camp29	India	2006