# Investigating the frequency of tick-borne infections in a case series of 37 youth diagnosed with pediatric bipolar disorder

## TL;DR

This study found that most children with bipolar disorder in a New Jersey clinic had evidence of tick-borne infections, suggesting a possible link between these infections and the condition.

## Contribution

The study expands on prior work by showing a high frequency of tick-borne infections in youth with pediatric bipolar disorder.

## Key findings

- 92% of the 37 youth showed evidence of tick-borne exposure.
- 81% met both laboratory and clinical criteria for tick-borne infections.
- Overlaps between bipolar disorder and tick-borne illness suggest a potential infectious contribution to the condition.

## Abstract

This retrospective chart review examined 37 youth with pediatric bipolar disorder from a private practice in the Lyme-endemic state of New Jersey, expanding on findings from 27 previously reported cases to explore the potential contribution of tick-borne infections to disease etiology.

Diagnoses were based on DSM-IV-TR and DSM-V criteria using parent and child interviews, questionnaires, and school reports. Initial screening evaluated for possible PANDAS/PANS, with testing for Group A beta-hemolytic streptococcus, Borrelia burgdorferi, Babesia, Bartonella, and Mycoplasma pneumoniae. Lyme disease testing included ELISA, Western Blot (IgM/IgG), and immunoblots, interpreted per CDC guidelines. Other pathogens were assessed via IgM/IgG titers, anti-streptolysin O, anti-DNAase B, fluorescent in situ hybridization, and blood cultures. A positive diagnosis required both laboratory evidence and clinician confirmation.

Babesia was detected in 51% (19/37), Bartonella in 49% (18/37), Mycoplasma pneumoniae in 38% (14/37), Borrelia burgdorferi in 22% (8/37), and Group A Streptococcus in 19% (7/37). Overall, 92% (34/37) had evidence of tick-borne exposure, with 81% (30/37) meeting both laboratory and clinical criteria.

More than three-quarters of the cohort demonstrated confirmed tick-borne infections. Overlaps between bipolar disorder and tick-borne illness—such as immune dysregulation, chronic symptomatology, and responsiveness to treatments like minocycline and anti-inflammatory agents—support further exploration of infectious contributors to pediatric bipolar disorder. While limited by its single-practice retrospective design, these findings suggest that tick-borne pathogens may play a role in the pathogenesis of bipolar symptoms in youth, warranting larger, controlled studies.