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" ... Digital wakes of nascent epidemics are the faint traces detectable when a few people—usually local hospitals and government officials—know that a serious disease outbreak is imminent. Wakes can be found by observing changes in the behavior or pattern of life of individuals or groups who typically would be the first to know when a new outbreak has started. These people are the "carnies in the coal mine". Observing their behavior constantly and in real time may seem intrusive but it is consistent with widely practiced commercial and political marketing activities using publicly available data. ... "