Bifidobacteria support optimal infant vaccine responses

Feargal J. Ryan, Michelle Clarke, Miriam A. Lynn, Saoirse C. Benson, Sonia McAlister, Lynne C. Giles, Jocelyn M. Choo, Charné Rossouw, Yan Yung Ng, Evgeny A. Semchenko, Alyson Richard, Lex E. X. Leong, Steven L. Taylor, Stephen J. Blake, Joyce I. Mugabushaka, Mary Walker, Steve L. Wesselingh, Paul V. Licciardi, Kate L. Seib, Damon J. Tumes, Peter Richmond, Geraint B. Rogers, Helen S. Marshall and David J. Lynn ()
Additional contact information
Feargal J. Ryan: South Australian Health and Medical Research Institute (SAHMRI)
Michelle Clarke: Women’s and Children’s Health Network
Miriam A. Lynn: South Australian Health and Medical Research Institute (SAHMRI)
Saoirse C. Benson: South Australian Health and Medical Research Institute (SAHMRI)
Sonia McAlister: The Kids Institute
Lynne C. Giles: The University of Adelaide
Jocelyn M. Choo: South Australian Health and Medical Research Institute (SAHMRI)
Charné Rossouw: South Australian Health and Medical Research Institute (SAHMRI)
Yan Yung Ng: Murdoch Children’s Research Institute
Evgeny A. Semchenko: Griffith University
Alyson Richard: Flinders University
Lex E. X. Leong: Flinders University
Steven L. Taylor: South Australian Health and Medical Research Institute (SAHMRI)
Stephen J. Blake: South Australian Health and Medical Research Institute (SAHMRI)
Joyce I. Mugabushaka: South Australian Health and Medical Research Institute (SAHMRI)
Mary Walker: Women’s and Children’s Health Network
Steve L. Wesselingh: South Australian Health and Medical Research Institute (SAHMRI)
Paul V. Licciardi: Murdoch Children’s Research Institute
Kate L. Seib: Griffith University
Damon J. Tumes: South Australian Health and Medical Research Institute (SAHMRI)
Peter Richmond: The Kids Institute
Geraint B. Rogers: South Australian Health and Medical Research Institute (SAHMRI)
Helen S. Marshall: Women’s and Children’s Health Network
David J. Lynn: South Australian Health and Medical Research Institute (SAHMRI)

Nature, 2025, vol. 641, issue 8062, 456-464

Abstract: Abstract Accumulating evidence indicates that antibiotic exposure may lead to impaired vaccine responses1–4; however, the mechanisms underlying this association remain poorly understood. Here we prospectively followed 191 healthy, vaginally born, term infants from birth to 15 months, using a systems vaccinology approach to assess the effects of antibiotic exposure on immune responses to vaccination. Exposure to direct neonatal but not intrapartum antibiotics was associated with significantly lower antibody titres against various polysaccharides in the 13-valent pneumococcal conjugate vaccine and the Haemophilus influenzae type b polyribosylribitol phosphate and diphtheria toxoid antigens in the combined 6-in-1 Infanrix Hexa vaccine at 7 months of age. Blood from infants exposed to neonatal antibiotics had an inflammatory transcriptional profile before vaccination; in addition, faecal metagenomics showed reduced abundance of Bifidobacterium species in these infants at the time of vaccination, which was correlated with reduced vaccine antibody titres 6 months later. In preclinical models, responses to the 13-valent pneumococcal conjugate vaccine were strongly dependent on an intact microbiota but could be restored in germ-free mice by administering a consortium of Bifidobacterium species or a probiotic already widely used in neonatal units. Our data suggest that microbiota-targeted interventions could mitigate the detrimental effects of early-life antibiotics on vaccine immunogenicity.

Date: 2025
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DOI: 10.1038/s41586-025-08796-4

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