In Niger, a combination of strong local seasonal variation in
measles transmission due to agricultural cycles and high birth rates, drives
locally erratic measles outbreaks, with frequent local fade-out during the
seasonal incidence troughs Ferrari 2008. When aggregated to the national
level, measles incidence shows regular and predictable annual cycles Ferrari 2010. An analysis over a 11 year
period from 2001 to 2011 showed that while no one district supported persistent
transmission, measles remained persistent regionally through metapopulation
dynamics Ferrari 2010.