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(a) Number of confirmed cases and (b) vulnerability for Lassa fever for different states in Nigeria based on cases up to 22 April 2018. For some states (Abia, Benue, Enugu, Gombe, Kaduna, Lagos) the vulnerability was undefined (as adaptive capacity was zero) and therefore not included in the analysis. The vertical lines represent the 95% confidence intervals. FCT, Federal Capital Territory. (Online version in colour.)
