D

Epidemiological (public health) surveillance is defined as the ongoing, systematic collection, analysis, interpretation and timely dissemination of health-related data for action—not simply one form of reporting such as active, passive or sentinel systems. This wording matches the term “epidemiological surveillance” itself, as described in standard references [Lee & Thacker, 2011, PMID 22099242; Hall et al., 2012, PMID 22832991].