Mastoiditis Identified as Leading Cause of Intracranial GAS Infections in Children
Mastoiditis accounted for 71.4% of intracranial group A Streptococcus (GAS) infections in children, according to a study presented at IDWeek 2026. The research, led by Khanh L. Nguyen, MD, of Texas Children’s Hospital, analyzed 864 invasive GAS (iGAS) cases from 2013 to 2023, revealing critical insights into the epidemiology and outcomes of these rare but severe infections.
Most Patients Show Epidural Abscesses or Meningeal Enhancement
The 28 cases of intracranial GAS infections involved children with a median age of 6.6 years, 57.2% of whom were female. Neuroimaging showed epidural abscesses and meningeal enhancement as the most frequent findings. Notably, 32.1% of patients underwent lumbar punctures, with a median cerebrospinal fluid white blood cell count of 524 cells/mm³.
Hematogenous Meningitis Requires ICU Admission and Surgery
Children with hematogenous meningitis, a less common but more severe presentation, were significantly younger (median age 0.8 years) and faced longer fever durations (6 days post-antibiotics). Over 90% of these patients required ICU admission. Surgical intervention was necessary for 94% of cases, with 67% of meningitis patients developing subdural empyema.
Penicillin Treats Infections but Seizures Persist in Some
Penicillin was the most frequently prescribed antibiotic, with 25% of patients receiving adjunctive protein synthesis inhibitors. Treatment duration averaged 30.5 days. Despite these efforts, 25% of patients developed long-term neurologic sequelae, primarily seizures. Hematogenous meningitis was associated with higher morbidity compared to mastoiditis.
Expert Perspectives and Study Limitations
Felice Adler-Shohet, MD, an infectious diseases specialist at UC Irvine, highlighted the study’s significance in understanding rare CNS GAS infections. She noted the absence of mortality in this cohort, contrasting with previous reports of 15% mortality. However, the study’s single-center, retrospective design limited its ability to fully stratify outcomes by age, sex, or disease severity.
Need for Larger, Multicenter Research
Adler-Shohet emphasized the importance of validating findings in larger, multicenter studies. Adler-Shohet noted that previous studies linked emm1 and emm12 to pediatric intracranial infections, suggesting the need for further analysis of GAS emm types.
Intracranial GAS Infections Cause Long-Term Neurologic Issues
Did you know? Invasive GAS infections of the central nervous system (CNS) are rare but can lead to severe complications. The study found that 25% of children with intracranial GAS infections developed long-term neurologic issues, such as seizures.
FAQ: Key Questions About the Study
Why is mastoiditis a significant source of intracranial GAS infections?
Nguyen’s study found that mastoiditis was the most common clinical syndrome (71.4%) among children with intracranial GAS infections.
What are the implications of the study’s findings for clinical practice?
The research shows that mastoiditis can be a precursor to severe CNS infections. It also highlights the need for aggressive management of hematogenous meningitis, which carries higher morbidity risks.
How does this study differ from previous research?
This study is one of the few to focus specifically on iGAS with intracranial extension. Unlike earlier reports, it provides detailed data on neurologic outcomes and treatment patterns, though its small sample size limits generalizability.