Paediatric Investigators Collaborative Network on Infections in Canada (PICNIC) study of aseptic meningitis.
BACKGROUND
The seasonality, clinical and radiographic features and outcome of aseptic meningitis have been described for regional outbreaks but data from a wider geographic area is necessary to delineate the epidemiology of this condition.


METHODS
A retrospective chart review was completed of children presenting with aseptic meningitis to eight Canadian pediatric hospitals over a two-year period.


RESULTS
There were 233 cases of proven enteroviral (EV) meningitis, 495 cases of clinical aseptic meningitis and 74 cases of possible aseptic meningitis with most cases occurring July to October. Headache, vomiting, meningismus and photophobia were more common in children > or = 5 years of age, while rash, diarrhea and cough were more common in children < 5 years of age. Pleocytosis was absent in 22.3% of children < 30 days of age with proven EV meningitis. Enterovirus was isolated in cerebrospinal fluid (CSF) from 154 of 389 patients (39.6%) who had viral culture performed, and a nucleic acid amplification test for enterovirus was positive in CSF from 81 of 149 patients (54.3%). Imaging of the head by computerized tomography or magnetic resonance imaging was completed in 96 cases (19.7%) and 24 had abnormal findings that were possibly related to meningitis while none had changes that were definitely related to meningitis. There was minimal morbidity and there were no deaths.


CONCLUSIONS
The clinical presentation of aseptic meningitis varies with the age of the child. Absence of CSF pleocytosis is common in infants < 30 days of age. Enterovirus is the predominant isolate, but no etiologic agent is identified in the majority of cases of aseptic meningitis in Canadian children.
Lee
Bonita E
BE
Department of Pediatrics, University of Alberta, Edmonton, Alberta, Canada. bonitlee@ualberta.ca
Chawla
Rupesh
R
Langley
Joanne M
JM
Forgie
Sarah E
SE
Al-Hosni
Mohammed
M
Baerg
Krista
K
Husain
Entesar
E
Strong
James
J
Robinson
Joan L
JL
Allen
Upton
U
Law
Barbara J
BJ
Dobson
Simon
S
Davies
H Dele
HD
D000293:Adolescent; D002170:Canada / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D004770:Enterovirus / Q000302:isolation & purification; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008582:Meningitis, Aseptic / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000503:physiopathology / Q000821:virology; D011859:Radiography; D012189:Retrospective Studies; D012307:Risk Factors; D012621:Seasons