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. 2015 Dec 28;10(12):e0144818. doi: 10.1371/journal.pone.0144818

Fig 4. Weekly directional ellipses showing an overall north-south orientation of virus spread.

Fig 4

No ellipse was generated for the first week because only one positive was reported that week. During the third week, an outlying positive in the southeastern extent of the outbreak caused a northwest to southeast orientation.