Illustration of the different phases of a dengue outbreak and different levels of response. An example of an outbreak curve from Colombia in 2009 is shown here. An ‘outbreak alert’ is identified early through a combination of ‘alert signals’, and triggers an ‘initial response’. The evolution into ‘early’ and ‘full outbreaks’ are detected early using standard definitions and trigger appropriately staged ‘early’ and ‘emergency responses’.
Badurdeen et al. BMC Public Health 2013 13:607 doi:10.1186/1471-2458-13-607