In Mahajanga, as had already been observed in 1907 (12), the plague season starts in July or August, during the dry season, when the air temperature is the lowest.
This is in contrast with the central highlands, where most of the cases occur between October and February, during the warmer rainy season (2).
In the urban plague focus of Mahajanga, as in the central highlands, transmission is believed to occur mostly inside houses.
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