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Sex difference in immune response to vaccination: A participant-level meta-analysis of randomized trials of IMVAMUNE smallpox vaccine.

AbstractINTRODUCTION:
Previous research shows immune response to vaccination differs by sex but this has not been explored for IMVAMUNE, a replication-deficient smallpox vaccine developed in response to the potential for bioterrorism using smallpox.
METHODS:
We conducted a participant-level meta-analysis (N=275, 136 men, 139 women) of 3 randomized trials of IMVAMUNE conducted at 13 centers in the US through a federally-funded extramural research program. Studies were eligible for inclusion if they tested the standard dose (1×10(8)TCID₅₀/mL on Days 0 and 28) of liquid formulation IMVAMUNE, were completed at the time of our search, and enrolled healthy vaccinia-naïve participants. Models of the peak log₂ ELISA and PRNT titers post-second vaccination were constructed for each study with sex as a covariate. Results from these models were combined into random effects meta-analyses of the sex difference in response to IMVAMUNE. We then compared this approach with fixed effects models using the combined participant level data.
RESULTS:
In each study the mean peak log₂ ELISA titer was higher in men than women but no single study demonstrated a statistically significant difference. Combination of the adjusted study-specific estimates into the random effects model showed a higher mean peak log₂-titer in men compared with women (absolute difference [men-women]: 0.32, 95% CI: 0.02-0.60). Fixed effects models controlling for study showed a similar result (log₂ ELISA titer, men-women: 0.34, 95% CI: 0.04-0.63). This equates to a geometric mean peak titer that is approximately 27% higher in men than women (95% CI: 3-55%). Peak log₂ PRNT titers were also higher (although not significantly) in men (men-women: 0.14, 95% CI: -0.30 to 0.58).
CONCLUSION:
Our results show statistically significant differences in response to IMVAMUNE comparing healthy, vaccinia-naïve men with women and suggest that sex should be considered in further development and deployment of IMVAMUNE and other MVA-based vaccines.
AuthorsJesse D Troy, Heather R Hill, Marian G Ewell, Sharon E Frey
JournalVaccine (Vaccine) Vol. 33 Issue 41 Pg. 5425-31 (Oct 5 2015) ISSN: 1873-2518 [Electronic] Netherlands
PMID26319063 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
CopyrightCopyright © 2015 Elsevier Ltd. All rights reserved.

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