the clinician caring for a child with focal encephalitis should institute broad-spectrum antimicrobial therapy plus acyclovir , pending definitive diagnosis by ancillary tests or brain biopsy , which is positive for hse 33 to 55 per cent of the time and is diagnostic for other treatable conditions 10 to 20 per cent of the time .
C0001367
acyclovir
C0276226
hse