About the Authors

Deborah A. Williamson

dwilliamson@adhb.govt.nz

Affiliations Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand, Department of Clinical Microbiology, Auckland District Health Board, Auckland, New Zealand, Institute of Environmental Science and Research, Wellington, New Zealand

Sally A. Roberts

Affiliation Department of Clinical Microbiology, Auckland District Health Board, Auckland, New Zealand

Stephen R. Ritchie

Affiliation Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand

Geoffrey W. Coombs

Affiliations PathWest Laboratory Medicine, Perth, Australia, Curtin University, Perth, Australia

John D. Fraser

Affiliation Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand

Helen Heffernan

Affiliation Institute of Environmental Science and Research, Wellington, New Zealand

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Made contribution to manuscript: JDF SRR. Conceived and designed the experiments: DAW HH. Performed the experiments: HH DAW. Analyzed the data: DAW HH. Contributed reagents/materials/analysis tools: DAW HH SAR GC. Wrote the paper: DAW HH.