Figure 2From: Epidemiological changes in meningococcal meningitis in Niger from 2008 to 2011 and the impact of vaccination Epidemic curves of confirmed N. meningitidis serogroups A (grey histograms) and W (black) cases on a weekly scale detected from 2008 to 2011. Vaccinations with polysaccharide (PS) bivalent A/C and trivalent A/C/W vaccines are indicated (with the number of administered doses). The three successive MenAfriVac® campaigns are also shown.Back to article page