Table 2.

Mortality rates of Meningococcal disease by serogroup in the city of Salvador and in the state of Bahia (without Salvador), Brazil, in pre- and post-vaccine periods.

	Meningococcal disease
	Salvador					Bahia (without Salvador)
	Deaths	Mortalityπ	RR*	95% CI†	p-value	Deaths	Mortalityπ	RR*	95% CI†	p-value
All cases
Pre-vaccine periodα	83	0.78	ref			109	0.25	ref
Post-vaccine periodβ	45	0.34	0.43	(0.30-0.62)	<0.0001	88	0.16	0.64	(0.48-0.85)	0.002
MenC
Pre-vaccine period	50	0.46	ref			27	0.06	ref
Post-vaccine period	27	0.20	0.43	(0.27-0.68)	0.005	33	0.06	0.97	(0.58-1.62)	0.9351
MenW
Pre-vaccine period	0	0.00	ref			1	0.002	ref
Post-vaccine period	6	0.04	—	—	0.25	6	0.01	4.8	(3.10-7.71)	<0.0001
MenB
Pre-vaccine period	4	0.04	ref			1	0.002	ref
Post-vaccine period	2	0.00	0.00	(0.00-39.00)	0.25	4	0.007	3.2	(2.02-5.23)	<0.0001
Unidentified Serogroups
Pre-vaccine period	29	0.26	ref			80	0.18	ref
Post-vaccine period	10	0.07	0.29	(0.29-1.50)	0.050	44	0.08	0.45	(0.18-1.03)	0.021

^*Relative risk;

^†Confidence interval;

^α2007-2010;

^β2011-2015;

^πAverage annual mortality rate per 100,000 population.