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Volume 25, Number 3—March 2019
Research

Use of Genomics to Investigate Historical Importation of Shiga Toxin–Producing Escherichia coli Serogroup O26 and Nontoxigenic Variants into New Zealand

A. Springer Browne1Comments to Author , Patrick J. Biggs, David A. Wilkinson, Adrian L. Cookson, Anne C. Midwinter, Samuel J. Bloomfield, C. Reed Hranac, Lynn E. Rogers, Jonathan C. Marshall, Jackie Benschop, Helen Withers, Steve Hathaway, Tessy George, Patricia Jaros, Hamid Irshad, Yang Fong, Muriel Dufour, Naveena Karki, Taylor Winkleman, and Nigel P. French
Author affiliations: Massey University, Palmerston North, New Zealand (A.S. Browne, P.J. Biggs, D.A. Wilkinson, A.L. Cookson, A.C. Midwinter, S.J. Bloomfield, C.R. Hranac, L.E. Rogers, J.C. Marshall, J. Benschop, T. George, P. Jaros, H. Irshad, Y. Fong, T. Winkleman, N.P. French); New Zealand Food Safety Science & Research Centre, Palmerston North (D.A. Wilkinson, N.P. French); AgResearch Limited, Palmerston North (A.L. Cookson); Ministry of Primary Industries, Wellington, New Zealand (H. Withers, S. Hathaway); Institute of Environmental Science and Research, Upper Hutt, New Zealand (M. Dufour, N. Karki)

Main Article

Figure 4

Maximum clade credibility tree of time of most recent common ancestor analysis of 344 Escherichia coli serogroup O26 sequence type 21 isolates in investigation of historical importation of Shiga toxin–producing E. coli serogroup O26 and nontoxigenic variants into New Zealand. Key convergence dates are annotated with 95% highest posterior density intervals, and the concentric circles indicate earlier time periods (blue, 100 years; gray, 50 years) from the age of the newest isolate (2017.5 in deci

Figure 4. Maximum clade credibility tree of time of most recent common ancestor analysis of 344 Escherichia coli serogroup O26 sequence type 21 isolates in investigation of historical importation of Shiga toxin–producing E. coli serogroup O26 and nontoxigenic variants into New Zealand. Key convergence dates are annotated with 95% highest posterior density intervals, and the concentric circles indicate earlier time periods (blue, 100 years; gray, 50 years) from the age of the newest isolate (2017.5 in decimal years).

Main Article

1Current affiliation: Centers for Disease Control and Prevention, Christiansted, Virgin Islands, USA.

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