Accuracy of Herpes Simplex Virus Polymerase Chain Reaction Testing of the Blood for Central Nervous System Herpes Simplex Virus Infections in Infants.

There were 1038 infants with herpes simplex virus polymerase chain reaction testing performed of blood and cerebrospinal fluid specimens. There were 21 (2.0%) with a positive cerebrospinal fluid PCR, of whom 16 also had a positive blood PCR (sensitivity 76%; 95% CI, 53%-92%). Blood PCR cannot exclude herpes simplex virus central nervous system infection.