March 22, 2019
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GSK’s MMR vaccine safe, effective for US infants

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Nicola P. Klein, MD, PhD
Nicola P. Klein

GlaxoSmithKline’s measles, mumps and rubella vaccine was found to be safe and effective in healthy children in a phase 3 clinical trial.

The findings of the study were previously presented at IDWeek and have now been published in the Journal of the Pediatric Infectious Diseases Society.

Nicola P. Klein, MD, PhD, a senior research scientist at the Kaiser Permanente Northern California Division of Research and director of the Kaiser Permanente Vaccine Study Center, and colleagues wrote that only one vaccine that protects against measles, mumps and rubella — MMR II (Merck) — is available for use in the U.S.

“We believe that if MMR-RIT (Priorix, GlaxoSmithKline) is licensed, it could provide a valid option to prevent measles, mumps and rubella in U.S. children,” Klein told Infectious Diseases in Children. “Plus, it could also help to reduce the potential risks of a vaccine shortage.”

In the study, healthy children in Estonia, Finland, Mexico, Spain and the U.S. aged 12 to 15 months were randomly assigned to receive a dose of either MMR-RIT, pulled from one of three lots, or MMR II in addition to all other age-recommended routine immunizations. The infants’ antibody concentrations and seroresponse rates were examined 43 days following vaccination.

Klein and colleagues observed “robust and noninferior” immune responses in infants vaccinated with MMR-RIT compared with those who received MMR II, and the immunogenicity of the three lots of MMR-RIT were consistent, with the researchers noting that nearly all (more than 97%) infants had a seroresponse to the MMR components.

Immunoresponses related to other vaccines given at the same time were comparable among infants receiving MMR II and MMR-RIT, and infants in both groups had similar reactogenicity profiles.

Furthermore, Klein and colleagues did not observe any safety concerns related to vaccination with MMR-RIT.

Like MMR II, MMR-RIT is a live virus vaccine.

“These results suggest that MMR-RIT could be a valid option for preventing measles, mumps and rubella in children in the U.S. and help to ensure that the U.S. has a second MMR vaccine available in the event of a hypothetical MMR vaccine shortage,” Klein and colleagues wrote. – by Katherine Bortz

Disclosures: Klein reports that she has received grants from GlaxoSmithKline, Merck, Pfizer, Sanofi Pasteur, Novartis, Protein Science and MedImmune. Please see the study for all other authors’ relevant financial disclosures.