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+--- Thread: Research Left or right arm? Research reveals why vaccination site matters for immune response (/thread-17883.html)
Left or right arm? Research reveals why vaccination site matters for immune response - C C - Apr 28, 2025
https://www.eurekalert.org/news-releases/1081581
INTRO: Sydney scientists have revealed why receiving a booster vaccine in the same arm as your first dose can generate a more effective immune response more quickly. The study, led by the Garvan Institute of Medical Research and the Kirby Institute at UNSW Sydney and published in the journal Cell, offers new insight that could help improve future vaccination strategies.
The researchers found that when a vaccine is administered, specialised immune cells called macrophages became ‘primed’ inside lymph nodes. These macrophages then direct the positioning of memory B cells to more effectively respond to the booster when given in the same arm.
The findings, made in mice and validated in human participants, provide evidence to refine vaccination approaches and offer a promising new approach for enhancing vaccine effectiveness.
“This is a fundamental discovery in how the immune system organises itself to respond better to external threats – nature has come up with this brilliant system and we're just now beginning to understand it,” says Professor Tri Phan, Director of the Precision Immunology Program at Garvan and co-senior author.
Scientia Professor Anthony Kelleher, Director of the Kirby Institute and co-senior author says: “A unique and elegant aspect of this study is the team’s ability to understand the rapid generation of effective vaccine responses. We did this by dissecting the complex biology in mice and then showed similar findings in humans. All this was done at the site of the generation of the vaccine response, the lymph node.” (MORE - details, no ads)