What is the approach to seasonal malaria chemoprevention in the Sahel and sub-Sahel regions of Africa?

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What is the approach to seasonal malaria chemoprevention in the Sahel and sub-Sahel regions of Africa?

Malaria transmission is concentrated during a few months of the year in much of the Sahel and sub-Sahel regions of Africa. In these areas, seasonal malaria chemoprevention — the administration of sulfadoxine–pyrimethamine plus amodiaquine to children at monthly intervals three or four times during the malaria-transmission season — has been a highly effective approach to malaria control. NEJM 6/6/2019