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Acute childhood encephalitis and Mycoplasma pneumoniae
A Bitnun1, E L Ford-Jones, M Petric
1Division of Infectious Diseases, Department of Pediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada.
Abstract:
In a prospective 5-year study of children with acute encephalitis, evidence of Mycoplasma pneumoniae infection was demonstrated in 50 (31%) of 159 children. In 11 (6.9%) of these patients, M. pneumoniae was determined to be the probable cause of encephalitis on the basis of its detection in cerebrospinal fluid (CSF) by polymerase chain reaction (PCR) or by positive results of serologic tests for M. pneumoniae and detection of the organism in the throat by PCR. CSF PCR positivity correlated with a shorter prodromal illness (P=.015) and lack of respiratory symptoms (P=.06). Long-term neurologic sequelae occurred in 64% of probable cases. Thirty children (18.9%) who were seropositive for M. pneumoniae but did not have the organism detected by culture or PCR had convincing evidence implicating other organisms as the cause of encephalitis, suggesting that current serologic assays for M. pneumoniae are not sufficiently specific to establish a diagnosis of M. pneumoniae encephalitis.
Insights
Mycoplasma pneumoniae caused encephalitis in 6.9% of children studied. Current serologic tests are not specific enough for diagnosis, indicating a need for improved diagnostic methods for Mycoplasma pneumoniae encephalitis.
Area of Science:
- Pediatric Neurology
- Infectious Diseases
Background:
- Acute encephalitis in children is a serious condition with various potential causes.
- Mycoplasma pneumoniae is a known pathogen that can cause respiratory illness and has been implicated in neurological conditions.
Purpose of the Study:
- To investigate the role of Mycoplasma pneumoniae in pediatric acute encephalitis.
- To evaluate the diagnostic accuracy of current methods for identifying M. pneumoniae as a cause of encephalitis.
Main Methods:
- Prospective 5-year study of 159 children with acute encephalitis.
- Detection of M. pneumoniae using cerebrospinal fluid (CSF) PCR and throat PCR.
- Serologic testing for M. pneumoniae antibodies.
Main Results:
- Evidence of M. pneumoniae infection in 31% of children.
- M. pneumoniae was the probable cause in 6.9% of cases, confirmed by CSF PCR or throat PCR with serology.
- CSF PCR positivity correlated with shorter prodromal illness and fewer respiratory symptoms.
- Long-term neurologic sequelae occurred in 64% of probable M. pneumoniae encephalitis cases.
- A significant proportion of seropositive children lacked organism detection, questioning the specificity of serology.
Conclusions:
- Mycoplasma pneumoniae is a probable cause of acute encephalitis in a subset of children.
- Current serologic assays for M. pneumoniae may lack specificity, potentially leading to misdiagnosis.
- Improved diagnostic strategies are needed to accurately identify M. pneumoniae as the causative agent of encephalitis.