Gregory J. Tyrrell

Gregory J. Tyrrell publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Gregory J. Tyrrell sits on this spectrum.

Gregory J. Tyrrell D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Gregory J. Tyrrell sits on this spectrum.

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