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Lack of association of group A streptococcal infections and onset of TiCs

  • on behalf of European Multicentre Tics in Children Study (EMTICS)
  • University College London
  • Hotchkiss Brain Institute (M.D.H. A.M.D. M.G. B.K.M.) University of Calgary.
  • Tel Aviv University
  • University of Bari
  • University of Rome La Sapienza
  • Istituto Superiore di Sanita
  • NIHR Great Ormond Street Biomedical Research Centre, London, UK
  • Department of Paediatric Nephrology, Evelina London Children’s Hospital, Guy’s & St Thomas’ NHS Foundation Trust, London, UK
  • Levvel
  • Amsterdam UMC, Department of Radiation Oncology, Amsterdam, Netherlands
  • Hospital Universitario Virgen del Rocio
  • CIBER - Center for Biomedical Research Network
  • University of Barcelona
  • August Pi i Sunyer Biomedical Research Institute
  • Instituto de Salud Carlos III
  • Ludwig Maximilian University of Munich
  • Hannover Medical School
  • University of Copenhagen
  • University of Lausanne
  • ASL BA
  • University of Catania
  • Technische Universität Dresden
  • Vadaskert Child and Adolescent Psychiatric Hospital, Budapest, Hungary
  • Universität Zürich
  • University of Groningen, University Medical Center Groningen

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Background and Objectives The goal of this work was to investigate the association between group A streptococcal (GAS) infections and tic incidence among unaffected children with a family history of chronic tic disorders (CTDs). Methods In a prospective cohort study, children with no history for tics who were 3 to 10 years of age with a first-degree relative with a CTD were recruited from the European Multicentre Tics in Children Study (EMTICS) across 16 European centers. Presence of GAS infection was assessed with throat swabs, serum anti–streptolysin O titers, and anti-DNAse titers blinded to clinical status. GAS exposure was defined with 4 different definitions based on these parameters. Cox regression analyses with time-varying GAS exposure were conducted to examine the association of onset of tics and GAS exposure during follow-up. Sensitivity analyses were conducted with Cox regression and logistic regression analyses. Results A total of 259 children were recruited; 1 child was found to have tic onset before study entry and therefore was excluded. Sixty-one children (23.6%) developed tics over an average follow-up period of 1 (SD 0.7) year. There was a strong association of sex and onset of tics, with girls having an ≈60% lower risk of developing tics compared to boys (hazard ratio [HR] 0.4, 95% confidence interval [CI] 0.2–0.7). However, there was no statistical evidence to suggest an association of any of the 4 GAS exposure definitions with tic onset (GAS exposure definition 1: HR 0.310, 95% CI 0.037–2.590; definition 2: HR 0.561, 95% CI 0.219–1.436; definition 3: HR 0.853, 95% CI 0.466–1.561; definition 4: HR 0.725, 95% CI 0.384–1.370). Discussion These results do not suggest an association between GAS exposure and development of tics. Classification of Evidence This study provides Class I evidence that group A streptococcal exposure does not associate with the development of tics in children with first-degree relatives with chronic tic disorder.
Original languageEnglish
Pages (from-to)E1175-E1183
JournalNeurology
Volume98
Issue number11
DOIs
Publication statusPublished - 15 Mar 2022

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