The most common organism is Herpes simplex type 1.

All patients with lymphocytic meningitis should be offered a HIV test.

Antibiotic Recommendation

Recommended duration: Repeat LP at day 14 If CSF HSV PCR negative on LP at day 14 stop treatment at day 14.

If CSF HSV PCR positive on LP at day 14 complete 21 days of treatment.

Antibiotic recommendation: 

Aciclovir 10mg/kg every 8 hours IV

Oral therapy is not appropriate. 

Calculate dose using ideal body weight if obese (i.e. weight >20% over IBW). If unsure use actual body weight and check with clinical pharmacist at earliest opportunity.