Fig. 1: Spatiotemporal emergence pattern of USUV in the Netherlands, 2016–2022.
From: Silent reservoir species are shaping the emergence of Usutu virus

Pink circles indicate detections in live birds, with sizes proportional to the number of detections. Green hexagons (30 km² in size) indicate detections in dead birds, with shading intensity reflecting the number of detections in dead free-ranging birds in that cell. Provincial borders are shown and are labelled with two-letter abbreviations in the 2016 map: FR, Friesland; GR, Groningen; DR, Drenthe; OV, Overijssel; FL, Flevoland; GE, Gelderland; UT, Utrecht; NH, Noord-Holland; ZH, Zuid-Holland; ZE, Zeeland; NB, Noord-Brabant; LI, Limburg. The figure is adapted from a related figure in ref. 20.