Does strep throat lead to the development of tics?

Date:
February 2, 2022
Source:
American Academy of Neurology
Summary:
A new study has found no link between a strep throat infection and
the development of tics in children who have a parent or sibling
with a chronic tic disorder.



FULL STORY ==========================================================================
A new study has found no link between a strep throat infection and
the development of tics in children who have a parent or sibling with
a chronic tic disorder. The research is published in the February 2,
2022, online issue of Neurology(R), the medical journal of the American
Academy of Neurology.


==========================================================================
Tics are repetitive movements and vocalizations prompted by an urge to
produce them. They are the defining feature of chronic tic disorders like Tourette syndrome, a neurodevelopmental disorder that begins in childhood.

"There has been much debate about whether the bacteria that causes strep throat, group A streptococcus, plays a role in the development of tic disorders, with previous research providing mixed results," said study
author Anette Eleonore Schrag, MD, PhD, of University College London in
the United Kingdom. "Our research looked at a population of children at
a higher risk of developing tics due to having a first-degree relative
with a tic disorder and did not find an association between exposure to
strep and the development of tics." The study involved 259 children,
age three to 10, who did not have tics but who had a parent or sibling diagnosed with a chronic tic disorder. These children were tested for
strep infection at the start and throughout the study, detected through
throat swabs, blood tests to detect antibodies that indicate a strep
infection, or a combination of these tests.

The participants were followed for an average of 1.6 years, with
alternating medical evaluations either in person or over the phone every
two months.

Parents also kept a weekly diary and were told to report any possible
sign of tics in their child as soon as possible. Tic onset was defined
as the occurrence of a sudden, involuntary movement or vocalization on
three or more days within a three-week period, which was always confirmed
on examination.

Over the course of the study, 61 children, or 24%, developed tics.

Researchers compared the frequency of tic disorders in children who had
strep and those who did not and found no association between having had
a strep infection and the development of tics. After adjusting for age,
sex and parental education level, there was still no association.

When researchers followed up with the participants two years after the
study ended, seven more children had developed tics, but researchers
still found no association between tics and strep.

Independent of strep, researchers found a strong association of sex and
the onset of tics, with girls having a 60% lower risk of developing tics
than boys, which is similar to the findings of previous studies.

Schrag said, "Future studies are needed to investigate whether pathogens
other than strep, or other factors that affect the immune system, play a specific role in the development of tics." A limitation of the study is
that participants were enrolled at multiple study centers across Europe,
rather than at one site, which may have resulted in small inconsistencies
in assessment of participants.

The study was supported by the European Union's Seventh Framework
Programme and other funding agencies.

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========================================================================== Journal Reference:
1. Anette Eleonore Schrag et al. Lack of Association of Group A
Streptococcal Infections and Onset of Tics: European
Multicenter Tics in Children Study. Neurology, 2022 DOI:
10.1212/WNL.0000000000013298 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2022/02/220202162745.htm

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