Increase in vector-borne disease reporting affecting humans and animals in Syria and neighboring countries after the onset of conflict: A ProMED analysis 2003–2018

•Reporting of vector-borne diseases increased after the onset of the Syrian conflict.•More vector-borne disease events were reported in both humans and animals.•Applying a One Health framework is important in analyzing trends during conflicts.•Informal digital disease surveillance tools help show disease trends in conflict.•Enhanced disease surveillance is critical to avert and manage outbreaks in conflict.