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Spatial and temporal EIR in Asembo Bay Cohort Project. Villages could be divided into three categories based on long-term EIR: low (N = 4), medium (N = 7), and high (N = 4). The means and upper SE are shown. Time periods when the average EIR were >0.5 infected bites/person/night (indicated by horizontal line) were defined as hypertransmission seasons. Season boundaries are indicated by vertical lines. J-93, January 1993, etc.
