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\section*{Discussion}  Case tree and checkerboard plots can assist epidemiologists with visualizing and analyzing zoonoses with human to human potential. The plots provide valuable insight into the dynamics of an outbreak not available using current visualization tools.   The basic reproductive number is easily visualized by evaluating the size and shape of each tree in the case tree plot over time. Functions available in epipy can further assist with basic reproduction number calculations. Clusters of trees that remains short and thin likely have poor human to human transmissibility, whereas trees that become progressively taller and wider as the outbreak progresses may be gaining in transmissibility. Case tree plots also allow quick identification of trees with an unusally large number of branches. This observation is useful for identifying superspreaders, who can play a critical role in accelerating an outbreak, as was the case of SARS. SARS\cite{SARS}.  The rate at which new trees pop up is useful for estimating spillover frequency, which in turn is useful for identifiying animal hosts. Numerous trees over a short period of time may suggest a domesticated or agricultural animal host rather than a wild animal. As case tree plots become more common, patterns will likely emerge that indicate certain emergence scenarios, similar to how the shape of epidemic curves can differentiate a point source outbreak from a continuous sort outbreak.