Gregory J. Tyrrell

Best Publications

• Crystal Structure of the Cell-Binding B Oligomer of Verotoxin-1 from E. Coli.

  Penelope E. Stein;Amechand Boodhoo;Gregory J. Tyrrell;James L. Brunton

  417
  Citations

• emm typing and validation of provisional M types for group A streptococci.

  R Facklam;B Beall;A Efstratiou;V Fischetti

  344
  Citations

• Changing Epidemiology of Invasive Pneumococcal Disease in Canada, 1998–2007: Update from the Calgary-Area Streptococcus pneumoniae Research (CASPER) Study

  James D. Kellner;Otto G. Vanderkooi;Otto G. Vanderkooi;Judy MacDonald;Judy MacDonald;Deirdre L. Church

  245
  Citations

• Molecular complexity of successive bacterial epidemics deconvoluted by comparative pathogenomics.

  Stephen B. Beres;Ronan K. Carroll;Patrick R. Shea;Izabela Sitkiewicz

  196
  Citations

• Antimicrobial resistance (AMR) in COVID-19 patients: a systematic review and meta-analysis (November 2019–June 2021)

  Unknown

  195
  Citations

• Invasive Disease Due to Group B Streptococcal Infection in Adults: Results From a Canadian, Population-Based, Active Laboratory Surveillance Study—1996

  Unknown

  173
  Citations

• Invasive pneumococcal disease among immunocompromised persons: implications for vaccination programs

  Altynay Shigayeva;Wallis Rudnick;Karen Green;Danny K Chen

  151
  Citations

• emm and sof gene sequence variation in relation to serological typing of opacity-factor-positive group A streptococci

  Bernard Beall;Giovanni Gherardi;Marguerite Lovgren;Richard R. Facklam

  142
  Citations

• Identification of Enterococcus Species and Phenotypically Similar Lactococcus and Vagococcus Species by Reverse Checkerboard Hybridization to Chaperonin 60 Gene Sequences

  Swee Han Goh;Richard R. Facklam;Michelle Chang;Janet E. Hill

  138
  Citations

• The effect of routine vaccination on invasive pneumococcal infections in Canadian children, Immunization Monitoring Program, Active 2000–2007

  Julie A. Bettinger;David W. Scheifele;James D. Kellner;Scott A. Halperin

  134
  Citations

• Serotype distribution of invasive Streptococcus pneumoniae in Canada after the introduction of the 13-valent pneumococcal conjugate vaccine, 2010–2012

  Walter H B Demczuk;Irene Martin;Averil Griffith;Brigitte Lefebvre

  126
  Citations

• Species identification of enterococci via intergenic ribosomal PCR.

  Unknown

  125
  Citations

• Epidemiology and genotype analysis of sapovirus associated with gastroenteritis outbreaks in Alberta, Canada: 2004–2007

  Xiaoli L. Pang;Bonita E. Lee;Gregory J. Tyrrell;Jutta K. Preiksaitis

  120
  Citations

• Alteration of the glycolipid binding specificity of the pig edema toxin from globotetraosyl to globotriaosyl ceramide alters in vivo tissue targetting and results in a verotoxin 1-like disease in pigs.

  B Boyd;G Tyrrell;M Maloney;C Gyles

  117
  Citations

• Increased risk of invasive pneumococcal disease in haematological and solid-organ malignancies.

  A Wong;T J Marrie;S Garg;J D Kellner

  113
  Citations

• Serotypes and antimicrobial susceptibilities of invasive Streptococcus pneumoniae pre- and post-seven valent pneumococcal conjugate vaccine introduction in Alberta, Canada, 2000-2006.

  Gregory J. Tyrrell;Marguerite Lovgren;Natalie Chui;Jessica Minion

  111
  Citations

• Characterization of Shiga-like toxin I B subunit purified from overproducing clones of the SLT-I B cistron.

  Karam Ramotar;B. Boyd;G. Tyrrell;J. Gariepy

  110
  Citations

• Enterococcus gilvus sp. nov. and Enterococcus pallens sp. nov. Isolated from Human Clinical Specimens

  Gregory J. Tyrrell;LeeAnn Turnbull;Lúcia M. Teixeira;Johanne Lefebvre

  108
  Citations

• Effects of routine infant vaccination with the 7-valent pneumococcal conjugate vaccine on nasopharyngeal colonization with streptococcus pneumoniae in children in Calgary, Canada.

  James D. Kellner;David Scheifele;Otto G. Vanderkooi;Judy MacDonald

  102
  Citations

• Alteration of the carbohydrate binding specificity of verotoxins from Gal alpha 1-4Gal to GalNAc beta 1-3Gal alpha 1-4Gal and vice versa by site-directed mutagenesis of the binding subunit

  Unknown

  102
  Citations