Fig. 1From: Short- and long-term humoral immune response against Yersinia pestis in plague patients, MadagascarLocation of the Districts included in the study sites and plague focus in Madagascar. Dashed line: limits of the main plague-endemic area in the central highlands of Madagascar (altitude > 800 m). This map, created using an open source Geographic Information System QGIS 3.4 software, is freely available for useBack to article page