Table 1.

Group A Meningococcal Carriage Before and After PsA-TT Campaigns in Burkina Faso and Chad

Country	Prevaccination			Postvaccination			Difference in Prevalence, % (aOR [95% CI])	P Value
	Sample, No.	Carriage, No.	Prevalence, %	Sample, No.	Carriage, No.	Prevalence, %
Burkina Faso	20 326	80	0.39	22 093	0	0	NA	.003
Chad	998a	6	0.6	5001b	1	0.02	98 (0.019 [.002–.138])
	4278c	32	0.7

Source: [5, 7, 8].

Abbreviations: aOR, adjusted odds ratio; CI, confidence interval; NA, not applicable.

^a First survey conducted September–November 2010 (13–15 months before vaccination).

^b Third survey, conducted April–June 2012 (4–6 months after vaccination).

^c Second survey, conducted August–October 2011 (2–4 months before vaccination).