Clinical Edge

Summaries of Must-Read Clinical Literature, Guidelines, and FDA Actions

Earlier diagnosis, treatment needed to curb dramatic rise in neonatal HSV

Key clinical point: Future studies that examine public strategies for prevention are needed if this trend is to be reversed.

Major finding: Incidence of neonatal herpes simplex is up 56% over the past 7 years.

Study details: Retrospective multistate longitudinal cohort study of 900 participants.

Disclosures: The authors had no relevant financial disclosures. The study was funded by the National Institutes of Health.


Mahant S et al. Pediatrics. 2019. doi: 10.1542/peds.2018-3233.


The rise in herpes simplex virus cases among neonates reported by Mahant et al. is significant, but there are other possible explanations that warrant additional research, James Gaensbauer, MD, and Joseph A. Grubenhoff, MD, wrote in an accompanying editorial.

Among those explanations, Dr. Gaensbauer and Dr. Grubenhoff cite recommendations made nationally in 2013 to screen asymptomatic infants who had been exposed to HSV at the time of delivery as one possible factor elevating the number of cases being reported. More widespread use of polymerase chain reaction (PCR)–based diagnostic testing, which is reported to be more sensitive, also could play a role in increasing the number of cases being identified.

As part of a larger diagnostic “conundrum” challenging clinicians, the editorialists noted that, at present, there is no uniform consensus for performing HSV testing and providing empirical treatment. “Current recommendations from the American Academy of Pediatrics identify and emphasize the importance of recognition of the factors associated with increased likelihood of HSV infection but do not specify a more comprehensive (e.g., all febrile infants) strategy.” Stakeholders should build flexibility into their recommended treatment approaches for the benefit of practitioners operating on the front lines, they advised.

Ultimately, if the increase in incidence of neonatal HSV cases proves largely attributable to the changing behaviors of young women, who have been engaging more frequently in oral sex, as Dr. Mahant and his colleagues suggest, further research will be warranted, cautioned Dr. Gaensbauer and Dr. Grubenhoff.

“With their work, the authors contribute further nuance to a complicated and ongoing question: How do we correctly identify all infants with neonatal HSV in a timely manner while avoiding subjecting large numbers of children to unnecessary tests and empirical treatments?” This debate “is likely to be transformed by increasing availability of rapid PCR testing for HSV,” they said.

The “pathway to better clarity will depend on researchers and clinicians such as Mahant et al., who continue to provide important data and ask critical questions,” Dr. Gaensbauer and Dr. Grubenhoff concluded.

Dr. Gaensbauer and Dr. Grubenhoff are affiliated with the Denver Health Medical Center; the Children’s Hospital Colorado, Aurora; and the department of pediatrics at University of Colorado at Denver, Aurora. This is a summarization of their editorial, which accompanied the article by Mahant et al. (Pediatrics. 2019 Mar. doi: 10.1542/peds.2019-0159). They received no external funding and had no relevant financial disclosures.