Table 2.

 West Africa 1968 pandemic influenza A (H3N2) articles included in review

Article and study type	Location	Time period	Specimen collection definition	Outcome measured	Population	Pandemic H3N2 attack rate
• Barme M, et al., Bull Soc Med Afr Noire Lang Fr. 1969 Cross‐Sectional Survey	Senegal	May to September 1969	Undefined ILI	Symptomatic influenza virus infection by culture and paired serology in a subset	Unreported number of symptomatic children and health care workers	Cannot be determined
• Schild GC, et al., Bull World Health Organ, 1977 Prospective Cohort	Two rural Gambia villages	Village 1: November 1968 to March 1969	Undefined ILI	Symptomatic influenza virus infection by paired serology	Village 1: 32 symptomatic persons had paired serology	Village 1: 31% (10/32)
		Village 2: January 1969 to March 1969			Village 2: 27 symptomatic persons had paired serology	Village 2: 22% (6/27)
• McGregor IA, et al., Br Med Bull, 1979 Prospective Cohort	Four rural Gambia villages	Village 1: March 1969 to November 1969; and March 1970 to November 1970	Undefined ILI	Symptomatic influenza virus infection by paired serology	Village 1: 277 symptomatic persons had paired serology	Village 1: 6% (17/277)
					Village 1: 312 symptomatic persons had paired serology	Village 1: 14% (43/312)
		Village 2–4: March 1969 to March 1970; and March 1970 to March 1971			Village 2–4: unreported number of symptomatic persons had paired serology categorized by age group	5–14 years  Village 2: 45%  Village 3: 20%  Village 4: 41% 15+ years  Village 2: 38%  Village 3: 12%  Village 4: 34%
					Village 2–4: unreported number of symptomatic persons had paired serology categorized by age group	5–14 years  Village 2: 3%  Village 3: 5%  Village 4: 2% 15+ years  Village 2: 3%  Village 3: 6%  Village 4: 5%

Paired serology, acute and convalescent sera; single serology, cross‐sectional single serum; ILI, influenza‐like illness. Geographic categories are based on United Nations geographic subregions. ⁴⁹