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Mortality levels for An. gambiae s.s. and An. arabiensis males and females exposed for 1h to insecticides and the synergist Piperonyl Butoxide (PBO) plus insecticide. The straight line depicts the level of 80% mortality and the dashed line 98% mortality. Mortalities <80% are indicative of resistance under WHO terminology and mortality of 80–98% indicates incipient resistance.
