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==Summary==
Contact tracing has been seen as an essential public health strategy since the mid-19th century, when it was realized by John Snow that mapping infections and outbreaks could help reduce the overall outbreak or at least contain it. Public health officials realized this was not only true for cholera but using contact tracing for other infectious disease has proven useful in limiting their impact on the public. New technologies should allow more rapid response and tracing of individuals as they help isolate local outbreak.
==References==