Table 2.

Inclusion and exclusion criteria of the studies included in this review.

Criteria	Inclusion	Exclusion
Limits	Written in the English language	Non–English-language studies
Type of MGa	Planned MG	Unplanned MGs
Type of intervention	A surveillance system implemented in an MG event using an electronic means (electronic, web-based, or digital surveillance system)	Traditional, indicator-based, non–web-based, or nonelectronic means
Type of study	Journal articles and peer-reviewed studies	Book chapters, periodic articles, and reports
Type of surveillance system	Implemented for infectious disease prevention and control at an MG event	Implemented for health hazards; infectious disease surveillance described at a country level not specific to the MG event

^aMG: mass gathering.