Dr Samuel Bloomfield


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Epidemiology, genomics and antimicrobial resistance of bacteria


I am a PostDoctoral Research Scientist at the Institute. My research interests include how pathogenic bacteria evolve, how they are transmitted and how they develop resistance to antibiotics. I completed my PhD at Massey University in 2017, studying the evolution and transmission of bacterial enteritis agents over the course of outbreaks.

In my current role, I use whole-genome sequencing to investigate the sources and spread of pathogenic and commensal bacteria, and the reservoirs and transfer of antimicrobial resistance in the food chain.

Key Publications

Bloomfield, S.J., Benschop, J., Biggs, P.J., Marshall, J.C., Hayman, D.T.S., Carter, P.E., Midwinter, A.C., Mather, A.E., French, N.P., 2017. Genomic analysis of Salmonella enterica serovar Typhimurium DT160 associated with a 14-year outbreak, New Zealand, 1998-2012. Emerg. Infect. Dis. 23, 906–913. doi:10.3201/eid2306.161934

Bloomfield, S.J., Midwinter, A.C., Biggs, P.J., French, N.P., Marshall, J.C., Hayman, D.T.S., Carter, P.E., Thornley, C., Yap, R., Benschop, J., 2018. Long-term colonization by Campylobacter jejuni within a human host: evolution, antimicrobial resistance, and adaptation. J. Infect. Dis. 217, 103–111. doi:10.1093/infdis/jix561

Bloomfield S,Benschop J,Midwinter AC,Biggs PJ,Marshall JC,Hayman DTS,Carter PE,Price-Carter M,Toombs-Ruane L,Gray H,Burgess S,French NP. (2021)

Genomic and phenotypic comparison of two Salmonella Typhimurium strains responsible for consecutive salmonellosis outbreaks in New Zealand

International Journal of Medical Microbiology

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Bloomfield S., Wilkinson D., Rogers L., Biggs P., French N., Mohan V., Savoian M., Venter P., Midwinter A.. (2020)

Campylobacter novaezeelandiae sp. nov., isolated from birds and water in New Zealand.

International journal of systematic and evolutionary microbiology

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Wilkinson D. A., Midwinter A. C., Kwan E., Bloomfield S., French N. P., Biggs P. J.. (2019)

Draft Whole-Genome Sequences of Three Isolates of a Novel Strain of a Campylobacter sp. Isolated from New Zealand Birds and Water.

Microbiology resource announcements, 8, e00258-19

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Browne A. S., Biggs P. J., Wilkinson D. A., Cookson A. L., Midwinter A. C., Bloomfield S. J., Hranac C. R., Rogers L. E., Marshall J. C., Benschop J., Withers H., Hathaway S., George T., Jaros P., Irshad H., Fong Y., Dufour M., Karki N., Winkleman T., French N. P.. (2019)

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

Emerging infectious diseases, 25, 489-500

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Bloomfield S., Vaughan T., Benschop J., Marshall J., Hayman D., Biggs P., Carter P., French N.. (2019)

Investigation of the validity of two Bayesian ancestral state reconstruction models for estimating Salmonella transmission during outbreaks.

PLoS ONE, 14, e0214169

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Ford L., Ingle D., Glass K., Veitch M., Williamson D. A., Harlock M., Gregory J., Stafford R., French N., Bloomfield S., Grange Z., Conway M. L., Kirk M. D.. (2019)

Whole-Genome Sequencing of Salmonella Mississippi and Typhimurium Definitive Type 160, Australia and New Zealand.

Emerging infectious diseases, 25, 1690-1697

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