Locations of African horse sickness (AHS) outbreaks in Western Cape Province,
South Africa, 2004–2014, including the spatial distribution of each of
the AHS virus type 1 outbreaks that have occurred in the AHS controlled area
since 1997. The AHS controlled area (shown in inset) is the combination of the
AHS free, AHS surveillance, and AHS protection zones (also shown). Individual
confirmed cases of AHS are indicated by solid dots. Half-shaded dots indicate
confirmed cases for which samples were sent for sequencing (as opposed to
confirmed cases that were not sequenced). The directional distribution of each
outbreak is indicated by ellipses based on SD.