Volume 9, Number 9—September 2003
Research
Aseptic Meningitis Epidemic during a West Nile Virus Avian Epizootic
Figure 1

Figure 1. Residents of Baltimore City and County evaluated at six hospitals and assigned aseptic meningitis ICD-9-CM discharge diagnosis codesa during June 1 – September 30, 1998-2001. a If during one season a patient had >1 discharge diagnosis codes for aseptic meningitis, the patient was only counted once.
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