Fig. 7

Spatial distribution of Ae. aegypti and dengue cases in 2013 and 2014. a. Spatial expansion of Ae. aegypti breeding in 2013 as compared to 2003. The breeding sites were identified based on island wide Aedes breeding data collected on a daily basis as part of vector control operations. The map was generated using the ArcGIS 10.1 ArcMap software (ESRI, CA, USA). b. Spatial distribution of dengue cases in 2013 and 2014. The spatial distribution of dengue cases in Singapore was generated using the kernel density tool in the spatial analyst toolbox of ArcGIS 10.1 ArcMap software (ESRI, CA, USA) based on a search radius of 400 m. Case density values were classified into four classes of < 25^th (2 cases/km²), 25^th-50^th (16-25 cases/km²), 51^st-75^th (56-61 cases/km²) and more than 75^th (217 cases/km²⁾ quantiles, using the quantile classification method and were displayed in tones of pink as shown in the legend