The data on cross-protection against gonorrhea by outer membrane vesicle (OMV)–based meningococcal B vaccine continue to look encouraging from a recent study in Clinical Infectious Diseases (2022; doi: 10.1093/cid/ciac436). The authors report matched-cohort study data involving over 33,000 teens/young adults followed at Kaiser Permanente Southern California during 2016-2020. Like the studies above, chlamydia-infected patients (n = 26,471) served as negative controls for the 6,641 gonorrhea patients. The researchers compared chances of getting gonorrhea vs. getting chlamydia in light of having previously gotten C4MenB vaccine (OMV-based) or MenACWY vaccine (not OMV-based). The authors reported gonorrhea incidence rates of 2.0/1,000 person-years (95% CI, 1.3–2.8) in 4CMenB vaccinees vs. 5.2 (4.6–5.8) for MenACWY recipients. An adjusted analysis revealed 46% lower gonorrhea rates in 4CMenB vs. MenACWY vaccinees. There was no difference in chlamydia rates.
We await prospective controlled data to validate these observational studies. However, it is intriguing that OMV-based meningococcal vaccine may be a two-fer vaccine with partial cross protection against gonorrhea because of outer membrane protein similarities between the two pathogens. These data seem worth sharing with families who are making decisions about whether to vaccinate their children against B strains of meningococcus whether or not the child has already had conjugate MenACWY.
Christopher J. Harrison, MD, is professor, University of Missouri Kansas City School of Medicine, department of medicine, infectious diseases section, Kansas City. He has no financial conflicts of interest.