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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 5

Maximum clade credibility tree of time of most recent common ancestor analysis of 48 Escherichia coli serogroup O26 sequence type 29 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 concentric circles indicate prior time periods (blue, 100 years; gray, 50 years) from the age of the newest isolate (2017.0411 in decimal

Figure 5. Maximum clade credibility tree of time of most recent common ancestor analysis of 48 Escherichia coli serogroup O26 sequence type 29 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 concentric circles indicate prior time periods (blue, 100 years; gray, 50 years) from the age of the newest isolate (2017.0411 in decimal years).

Main Article

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

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