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. Author manuscript; available in PMC: 2021 Apr 2.
Published in final edited form as: Annu Rev Public Health. 2020 Jan 6;41:101–118. doi: 10.1146/annurev-publhealth-040119-094402

Figure 1:

Figure 1:

Major events in digital public health surveillance. Abbreviations: GFT: Google Flu Trends, GDT: Google Dengue Trends. ProMED-mail (69), de Grote Griepmeting (63), Web page views used for flu surveillance (59), Google ad click rate used for surveillance (41), HealthMap (20), H1N1 missed by GFT (31), FluNearYou (102), GFT overestimates (77), FluSight (6), GFT and GDT no longer available (2).